setcookie

(PHP 4, PHP 5, PHP 7)

setcookieEnvoie un cookie

Description

setcookie ( string $name [, string $value = "" [, int $expires = 0 [, string $path = "" [, string $domain = "" [, bool $secure = FALSE [, bool $httponly = FALSE ]]]]]] ) : bool
setcookie ( string $name [, string $value = "" [, array $options = [] ]] ) : bool

setcookie() définit un cookie qui sera envoyé avec le reste des en-têtes HTTP. Comme pour les autres en-têtes, les cookies doivent être envoyés avant toute autre sortie (c'est une restriction du protocole HTTP, pas de PHP). Cela vous impose d'appeler cette fonction avant toute balise <html> ou <head> et aussi des charactères d'espacement blanc.

Une fois que les cookies ont été placés, ils seront accessible lors du prochain chargement de page dans le tableau $_COOKIE. Les valeurs des cookies peuvent aussi exister dans la variable $_REQUEST.

Liste de paramètres

La » RFC 6265 est la référence pour l'interprétation des paramètres passés à setcookie().

name

Le nom du cookie.

value

La valeur du cookie. Cette valeur est stockée sur l'ordinateur du client ; ne stockez pas d'informations importantes. Si le paramètre name vaut 'cookiename', cette valeur est récupéré avec $_COOKIE['cookiename'].

expires

Le temps après lequel le cookie expire. C'est un timestamp Unix, donc, ce sera un nombre de secondes depuis l'époque Unix (1 Janvier 1970). En d'autres termes, vous devriez fixer cette valeur à l'aide de la fonction time() en y ajoutant le nombre de secondes après lequel on veut que le cookie expire. Vous pouvez utiliser aussi mktime(). time()+60*60*24*30 fera expirer le cookie dans 30 jours. Si vous ne spécifiez pas ce paramètre ou s'il vaut 0, le cookie expirera à la fin de la session (lorsque le navigateur sera fermé).

Note:

Vous pourrez noter que le paramètre expires prend un timestamp unique, et non pas la date au format Jour, JJ-Mois-AAAA HH:MM:SS GMT, car PHP fait la conversion en interne.

path

Le chemin sur le serveur sur lequel le cookie sera disponible. Si la valeur est '/', le cookie sera disponible sur l'ensemble du domaine domain. Si la valeur est '/foo/', le cookie sera uniquement disponible dans le répertoire /foo/ ainsi que tous ses sous-répertoires comme /foo/bar/ dans le domaine domain. La valeur par défaut est le répertoire courant où le cookie a été défini.

domain

Le (sous-)domaine pour lequel le cookie est disponible. Définir ceci à un sous-domaine (tel que 'www.example.com') rendra le cookie disponible pour ce sous-domaine ainsi que tous ses sous-domaines (par exemple: w2.www.example.com). Pour rendre le cookie disponible sur tout le domaine (ainsi que tous ses sous-domaines), définissez simplement la valeur avec le nom de domaine ('example.com', avec cet exemple).

Les anciens navigateurs continuant d'implémenter la » RFC 2109 (obsolète) peuvent nécessiter un . pour rendre disponible tous les sous-domaines.

secure

Indique si le cookie doit uniquement être transmis à travers une connexion sécurisée HTTPS depuis le client. Lorsque ce paramètre vaut TRUE, le cookie ne sera envoyé que si la connexion est sécurisée. Côté serveur, c'est au développeur d'envoyer ce genre de cookie uniquement sur les connexions sécurisées (par exemple, en utilisant la variable $_SERVER["HTTPS"]).

httponly

Lorsque ce paramètre vaut TRUE, le cookie ne sera accessible que par le protocole HTTP. Cela signifie que le cookie ne sera pas accessible via des langages de scripts, comme Javascript. Il a été suggéré que cette configuration permet de limiter les attaques via XSS (bien qu'elle ne soit pas supportée par tous les navigateurs), néanmoins ce fait est souvent contesté. TRUE ou FALSE

options

Un tableau associatif qui peut avoir comme clés expires, path, domain, secure, httponly et samesite. Si une autre clé est présente une erreur de niveau E_WARNING est émise. Les valeurs ont la même signification que celles décrits pour les paramètres avec le même nom. La valeur de l'élément samesite doit être None, Lax ou Strict. Si une options autorisé n'est pas donnée alors sa valeur par défaut sera identique à la valeur par défaut des paramètres explicite. Si l'élément samesite est omit, alors l'attribut SameSite du cookie ne sera pas définie.

Valeurs de retour

Si quelque chose a été envoyé sur la sortie standard avant l'appel à cette fonction, setcookie() échouera et retournera FALSE. Si setcookie() réussi, elle retournera TRUE. Cela n'indique pas si le client accepte ou pas le cookie.

Exemples

Quelques exemples d'envoi de cookies :

Exemple #1 Exemple d'envoi d'un cookie avec setcookie()

<?php
$value 
'Valeur de test';

setcookie("TestCookie"$value);
setcookie("TestCookie"$valuetime()+3600);  /* expire dans 1 heure */
setcookie("TestCookie"$valuetime()+3600"/~rasmus/""example.com"1);
?>

Notez que la partie "valeur" du cookie sera automatiquement encodée URL lorsque vous envoyez le cookie et, lorsque vous le recevez, il sera automatiquement décodé et affecté à la variable du même nom que le cookie. Si vous ne souhaitez pas ce comportement par défaut, vous pouvez utiliser la fonction setrawcookie(). Pour voir le résultat, essayez les scripts suivants :

<?php
// Afficher un cookie
echo $_COOKIE["TestCookie"];

// Une autre méthode pour afficher tous les cookies
print_r($_COOKIE);
?>

Exemple #2 Exemple d'effacement d'un cookie avec setcookie()

Pour effacer un cookie sur le client, vous devez toujours vous assurer que sa date d'expiration est passée, pour déclencher le mécanisme du navigateur client. Voici comment procéder :

<?php
// Définie la date d'expiration à une heure avant la date courante
setcookie("TestCookie"""time() - 3600);
setcookie("TestCookie"""time() - 3600"/~rasmus/""example.com"1);
?>

Exemple #3 setcookie() et les tableaux

Vous pouvez aussi utiliser les cookies avec des tableaux, en utilisant la notation des tableaux. Cela a pour effet de créer autant de cookies que votre tableau a d'éléments, mais lorsque les cookies seront reçus par votre script, les valeurs seront placées dans un tableau :

<?php
// Définit les cookies
setcookie("cookie[three]""cookiethree");
setcookie("cookie[two]""cookietwo");
setcookie("cookie[one]""cookieone");

// Après le rechargemet de la page, nous les affichons
if (isset($_COOKIE['cookie'])) {
    foreach (
$_COOKIE['cookie'] as $name => $value) {
        
$name htmlspecialchars($name);
        
$value htmlspecialchars($value);        
        echo 
"$name : $value <br />\n";
    }
}
?>

L'exemple ci-dessus va afficher :

three : cookiethree
two : cookietwo
one : cookieone

Note: L'utilisation des caractères de séparation comme [ et ] comme faisant partie du nom du cookie n'est pas respectueux de la RFC 6265, section 4, mais est supposé être supporté par les user agents, suivant la RFC 6265, section 5.

Historique

Version Description
7.3.0 Une signature alternative supportant un tableau d'options a été ajouté. Cette signature supporte la définition de l'attribut SameSite du cookie.

Notes

Note:

Vous pouvez utiliser la bufferisation de sortie pour pouvoir envoyer du contenu avant d'appeler cette fonction, avec la contrepartie que toute votre page sera envoyée en une fois. Vous pouvez faire cela en appelant ob_start() et ob_end_flush() dans votre script, ou en activant la directive output_buffering dans votre fichier de configuration php.ini ou dans le fichier de configuration de votre serveur.

Note:

Si la directive PHP register_globals est positionnée à on, la valeur du cookie est aussi disponible dans une variable. Dans l'exemple ci-dessous, $TestCookie existe. Il est vivement recommandé d'utiliser $_COOKIE.

Erreurs communes :

  • Les cookies ne seront accessibles qu'au chargement de la prochaine page, ou au rechargement de la page courante. Pour tester si un cookie a été défini avec succès, vérifiez la présence du cookie au prochain chargement de la page avant que le cookie n'expire. Le délai d'expiration est défini en utilisant le paramètre expires. Une façon simple de vérifier le positionnement du cookie est d'utiliser print_r($_COOKIE);.
  • Les cookies doivent être effacés avec les mêmes paramètres que ceux utilisés lors de leur création. Si l'argument value est une chaîne vide ou vaut FALSE et que les autres arguments sont exactement les mêmes que lors du positionnement du cookie, alors le cookie sera effacé du client. En interne, l'effacement est réalisé en positionnant la valeur à 'deleted' et la date d'expiration à une année dans le passé.
  • Du fait que l'assignation d'une valeur valant FALSE à un cookie tente de l'effacer, vous ne devriez pas utiliser de booléen. À la place, utilisez 0 pour FALSE et 1 pour TRUE.
  • Les noms des cookies peuvent être des tableaux de noms et seront disponibles dans vos scripts PHP sous la forme de tableaux mais des cookies différents seront placés sur le client. Utilisez explode() pour placer un cookie avec des noms et des valeurs multiples. Il n'est pas recommandé d'utiliser la fonction serialize() pour réaliser ceci, car cela peut conduire à des problèmes de sécurité.

Les appels multiples à la fonction setcookie() seront effectués dans l'ordre.

Voir aussi

add a note add a note

User Contributed Notes 44 notes

up
346
walterquez
8 years ago
Instead of this:
<?php setcookie( "TestCookie", $value, time()+(60*60*24*30) ); ?>

You can this:
<?php setcookie( "TestCookie", $value, strtotime( '+30 days' ) ); ?>
up
192
Bachsau
8 years ago
Want to remove a cookie?

Many people do it the complicated way:
setcookie('name', 'content', time()-3600);

But why do you make it so complicated and risk it not working, when the client's time is wrong? Why fiddle around with time();

Here's the easiest way to unset a cookie:
setcookie('name', 'content', 1);

Thats it.
up
9
Anonymous
2 months ago
Just an example to clarify the use of the array options, especially since Mozilla is going to deprecate / penalise the use of SameSite = none,  which is used by default if not using array options.

<?php
$arr_cookie_options
= array (
               
'expires' => time() + 60*60*24*30,
               
'path' => '/',
               
'domain' => '.example.com', // leading dot for compatibility or use subdomain
               
'secure' => true,     // or false
               
'httponly' => true,    // or false
               
'samesite' => 'None' // None || Lax  || Strict
               
);
setcookie('TestCookie', 'The Cookie Value', $arr_cookie_options);   
?>
up
31
paul nospam AT nospam sitepoint dot com
13 years ago
Note when setting "array cookies" that a separate cookie is set for each element of the array.

On high traffic sites, this can substantially increase the size of subsequent HTTP requests from clients (including requests for static content on the same domain).

More importantly though, the cookie specification says that browsers need only accept 20 cookies per domain.  This limit is increased to 50 by Firefox, and to 30 by Opera, but IE6 and IE7 enforce the limit of 20 cookie per domain.  Any cookies beyond this limit will either knock out an older cookie or be ignored/rejected by the browser.
up
36
Anonymous
13 years ago
something that wasn't made clear to me here and totally confused me for a while was that domain names must contain at least two dots (.), hence 'localhost' is invalid and the browser will refuse to set the cookie! instead for localhost you should use false.

to make your code work on both localhost and a proper domain, you can do this:

<?php

$domain
= ($_SERVER['HTTP_HOST'] != 'localhost') ? $_SERVER['HTTP_HOST'] : false;
setcookie('cookiename', 'data', time()+60*60*24*365, '/', $domain, false);

?>
up
8
user at example.com
9 months ago
As of PHP 7.3.0 the setcookie() method supports the SameSite attribute in its options and will accept None as a valid value.

For earlier versions of PHP,  you can set the header() directly:

header('Set-Cookie: cross-site-cookie=bar; SameSite=None; Secure');
up
16
gabe at fijiwebdesign dot com
13 years ago
If you want to delete all cookies on your domain, you may want to use the value of:

<?php $_SERVER['HTTP_COOKIE'] ?>

rather than:

<?php $_COOKIE ?>

to dertermine the cookie names.
If cookie names are in Array notation, eg: user[username]
Then PHP will automatically create a corresponding array in $_COOKIE. Instead use $_SERVER['HTTP_COOKIE'] as it mirrors the actual HTTP Request header.

<?php

// unset cookies
if (isset($_SERVER['HTTP_COOKIE'])) {
   
$cookies = explode(';', $_SERVER['HTTP_COOKIE']);
    foreach(
$cookies as $cookie) {
       
$parts = explode('=', $cookie);
       
$name = trim($parts[0]);
       
setcookie($name, '', time()-1000);
       
setcookie($name, '', time()-1000, '/');
    }
}

?>
up
14
nacho at casinelli dot com
3 years ago
It's worth a mention: you should avoid dots on cookie names.

<?php
// this will actually set 'ace_fontSize' name:
setcookie( 'ace.fontSize', 18 );
?>
up
13
bluewaterbob
13 years ago
if you are having problems seeing cookies sometimes or deleting cookies sometimes, despite following the advice below, make sure you are setting the cookie with the domain argument. Set it with the dot before the domain as the examples show: ".example.com".  I wasn't specifying the domain, and finally realized I was setting the cookie when the browser url had the http://www.example.com and later trying to delete it when the url didn't have the www. ie. http://example.com. This also caused the page to be unable to find the cookie when the www. wasn't in the domain.  (When you add the domain argument to the setcookie code that creates the cookie, make sure you also add it to the code that deletes the cookie.)
up
11
MrXCol
9 years ago
If you're having problem with IE not accepting session cookies this could help:

It seems the IE (6, 7, 8 and 9) do not accept the part 'Expire=0' when setting a session cookie. To fix it just don't put any expire at all. The default behavior when the 'Expire' is not set is to set the cookie as a session one.

(Firefox doesn't complains, btw.)
up
2
synnus at gmail dot com
2 months ago
The " PHPSESSID " cookie will soon be rejected because its " sameSite " attribute is set to " none " or an invalid value, and without " secure " attribute. To learn more about the "sameSite" attribute, visit https://developer.mozilla.org/docs/Web/HTTP/Headers/Set-Cookie/SameSite.

<?php
ini_set
("session.cookie_secure", 1);
session_start();

my PHP code ....

?>
up
9
Eric
10 years ago
The server my php code is running on has sessions disabled so I am forced to store a fair bit of arbitrary data in cookies.  Using array names was impractical and problematic, so I implemented a splitting routine.  I do not serialize any class instances, just arrays and simple objects.

In a nutshell, when setting a cookie value, I serialize it, gzcompress it, base64 encode it, break it into pieces and store it as a set of cookies.  To fetch the cookie value I get the named piece then iterate through piece names rebuilding the base64 data, then reverse the rest of the process.  The only other trick is deleting the pieces correctly.

Sessions are better, but if they are not available this is a viable alternative.  I chose gz over bz for compression because it looked faster with only slightly worse ratios.

Here is a simplified version of my implementation.  This is a good starting point but is not suitable for most uses.  For example, the domain and path are hard coded and no return values are checked for validity.

<?php
define
( 'COOKIE_PORTIONS' , '_piece_' );

function
clearpieces( $inKey , $inFirst ) {
   
$expire = time()-3600;
   
    for (
$index = $inFirst ; array_key_exists( $inKey.COOKIE_PORTIONS.$index , $_COOKIE ) ; $index += 1 ) {
       
setcookie( $inKey.COOKIE_PORTIONS.$index , '' , $expire , '/' , '' , 0 );
        unset(
$_COOKIE[$inKey.COOKIE_PORTIONS.$index] );
    }
}

function
clearcookie( $inKey ) {
   
clearpieces( $inKey , 1 );
   
setcookie( $inKey , '' , time()-3600 , '/' , '' , 0 );
    unset(
$_COOKIE[$inKey] );
}

function
storecookie( $inKey , $inValue , $inExpire ) {
   
$decode = serialize( $inValue );
   
$decode = gzcompress( $decode );
   
$decode = base64_encode( $decode );
   
   
$split = str_split( $decode , 4000 );//4k pieces
   
$count = count( $split );
   
    for (
$index = 0 ; $index < $count ; $index += 1 ) {
       
$result = setcookie( ( $index > 0 ) ? $inKey.COOKIE_PORTIONS.$index : $inKey , $split[$index] , $inExpire , '/' , '' , 0 );
    }
   
   
clearpieces( $inKey , $count );
}

function
fetchcookie( $inKey ) {
   
$decode = $_COOKIE[$inKey];
   
    for (
$index = 1 ; array_key_exists( $inKey.COOKIE_PORTIONS.$index , $_COOKIE ) ; $index += 1 ) {
       
$decode .= $_COOKIE[$inKey.COOKIE_PORTIONS.$index];
    }
   
   
$decode = base64_decode( $decode );
   
$decode = gzuncompress( $decode );
   
    return
unserialize( $decode );
}
?>
up
6
ellert at vankoperen dot nl
6 years ago
Caveat: if you use URL RewriteRules to get stuff like this: domain.com/bla/stuf/etc into parameters, you might run into a hickup when setting cookies.
At least in my setup a change in one of the parameters resulted in the cookie not being 'there' anymore.
The fix is simple: specify the domain. '/' will usualy do fine.
up
3
lferro9000 at gmail dot com
3 years ago
Of notice, the cookie when set with a zero expire or ommited WILL not expire when the browser closes.

What happens is that the browser, when closes the window, if it is a well behaved browser, will delete the cookie from the cookie store.

However, the cookie will survive in the server until the garbage collector removes the session, which will happen only when it kicks in and checks the specified session is out of bounds of the setting stated in:

http://php.net/manual/en/session.configuration.php#ini.session.gc-maxlifetime

Please check also:

http://php.net/manual/en/session.security.ini.php

And in case of doubt, PHP runs on the webserver and has no way whatsoever to interact with a browser apart from receiving requests and answering with responses, so assuming that a cookie will be removed from a browser is just an "hint" for the browser. There is no warranty that such will happen as instructed.

That is one of the reasons why the cookie values sent to browsers by some platforms are encrypted and timestamped, to ensure that they are actual and not tampered.
up
1
dont at mail dot me
3 years ago
> "When deleting a cookie you should assure that the expiration date is in the past, to trigger the removal mechanism in your browser"

This part of the documentation is no longer accurate. On my version of PHP (5.6.28) setting a null, empty string or boolean false value causes the server to ignore your expire date parameter and always sends value "deleted" and expire date 1970-01-01 00:00:01.
up
2
dmitry dot koterov at gmail dot com
5 years ago
Note that at least in PHP 5.5 setcookie() removes previously set cookies with the same name (even if you've set them via header()), so previously fired Set-Cookie headers with e.g. PHPSESSID name are not flushed to the browser. Even headers_list() doesn't see them after session_start():

header("Set-Cookie: PHPSESSID=abc; path=/; domain=.sub.domain.com");
header("Set-Cookie: PHPSESSID=abc; path=/; domain=.domain.com");
print_r(headers_list()); // here you see two Set-Cookie headers with domains for PHPSESSID
session_id('abc');
session_start();
print_r(headers_list()); // here you don't; you see only one Set-Cookie produced by session_start()
up
6
gareth at gw126 dot com
14 years ago
You can use cookies to prevent a browser refresh repeating some action from a form post... (providing the client is cookie enabled!)

<?php
//Flag up repeat actions (like credit card transaction, etc)
if(count($_POST)>0) {
   
$lastpost= isset($_COOKIE['lastpost']) ? $_COOKIE['lastpost'] : '';
    if(
$lastpost!=md5(serialize($_POST))) {
       
setcookie('lastpost', md5(serialize($_POST)));
       
$_POST['_REPEATED']=0;
    } else {
       
$_POST['_REPEATED']=1;
    }
}

//At this point, if $_POST['_REPEATED']==1, then  the user
//has hit the refresh button; so don't do any actions that you don't
//want to repeat!
?>

Hope that helps :)

Gareth
up
5
jay at w3prodigy dot com
10 years ago
You can also delete cookies by supplying setcookie an empty value.

setcookie("w3p_cookie", "");
up
9
jonathan dot bergeron at rve dot ulaval dot ca
13 years ago
About the delete part, I found that Firefox only remove the cookie when you submit the same values for all parameters, except the date, which sould be in the past. Submiting blank values didn't work for me.

Example :
- set -

<?php setcookie( "name", "value", "future_timestamp", "path", "domain" ); ?>

- delete -
<?php setcookie( "name", "value", "past_timestamp", "path", "domain" ); ?>

Jonathan
up
5
jdknock (at) gMaIl (dot) com
9 years ago
IE7 can have trouble with settings cookies that are embedded in an iframe. The problem lies with a W3C standard called Platform for Privacy Preferences or P3P for short.

To overcome, include the header:

header('P3P:CP="IDC DSP COR ADM DEVi TAIi PSA PSD IVAi IVDi CONi HIS OUR IND CNT"');

before setting the cookie.
up
6
Carl V
15 years ago
If you want to delete all the cookies set by your domain, you may run the following:

<?php
$cookiesSet
= array_keys($_COOKIE);
for (
$x=0;$x<count($cookiesSet);$x++) setcookie($cookiesSet[$x],"",time()-1);
?>

Very useful when doing logout scripts and the cookie name may have changed (long story).
up
5
laffen
11 years ago
Note that the $_COOKIE variable not will hold multiple cookies with the same name. It is legitimate to set two cookies with the same name to the same host where the sub domain is different.
<?php
setcookie
("testcookie", "value1hostonly", time(), "/", ".example.com", 0, true);
setcookie("testcookie", "value2subdom", time(), "/", "subdom.example.com", 0, true);
?>
The next request from the browser will have both cookies in the $_SERVER['HTTP_COOKIE'] variable, but only one of them will be found in the $_COOKIE variable. Requests to subdom.example.com will have both cookies, while browser request to example.com or www.example.com only sends the cookie with the "value1hostonly" value.

<?php
$kaker
= explode(";", $_SERVER['HTTP_COOKIE']);
foreach(
$kaker as $val){
   
$k = explode("=", $val);
    echo
trim($k[0]) . " => " . $k[1];
}

// output
testcookie => value1hostonly
testcookie
=> value2subdom

?>
up
5
ahmetantmen at msn dot com
13 years ago
You can be sure about the cookie files contents weren't changed.

<?php

$Seperator
= '--';
$uniqueID = 'Ju?hG&F0yh9?=/6*GVfd-d8u6f86hp';
$Data = 'Ahmet '.md5('123456789');

setcookie('VerifyUser', $Data.$Seperator.md5($Data.$uniqueID));

if (
$_COOKIE) {
  
$Cut = explode($Seperator, $_COOKIE['VerifyUser']);
   if (
md5($Cut[0].$uniqueID) === $Cut[1]) {
      
$_COOKIE['VerifyUser'] = $Cut[0];
   } else {
       die(
'Cookie data is invalid!!!');
   }
}

echo
$_COOKIE['VerifyUser'];

?>

Create a unique id for your site and create a hash with md5($Data.$uniqueID). Attacker can understant that it must be re-hash after change cookie content.
But doesn't. Because cannot guess your unique id. Seperate your hash and data with seperator and send that cookie. Control that hash of returned value and your unique id's is same returned hash. Otherwise you have to stop attack. Sorry for my poor english!
up
5
mkmohsinali at gmail dot com
9 years ago
#cookies.php
/*This code will demonstrate use of cookies with PHP
It is very easy to understand and is better for beginner to
understand and get idea about power of cookies when used
with PHP.Here we give user a form to choose colors he/she
likes for website and when he/she visits site again within one
hour his/her settings are saved and read from cookie
and he/she doesn't have to set the page color and page
text color again.You can change time from 3600
seconds to whatever you deem appropriate in your case.
if you don't understand anything please email me*/

<?php
#checking if form has been submitted
if (isset($_POST['submitted'])){
#if yes (form is submitted) assign values from POST array to variables
$newbgColor=$_POST['bgColor'];
$newtxtColor=$_POST['txtColor'];
#set cookies
setcookie("bgColor",$newbgColor,time()+3600);
setcookie("txtColor",$newtxtColor,time()+3600);

}
#in case user has come for first time and cookies are not set then
if ((!isset($_COOKIE['bgColor']) ) && (!isset($_COOKIE['txtColor']))){
$bgColor = "Black";
$txtColor="White";
}
#if cookies are set then use them
else{
$bgColor = $_COOKIE['bgColor'];
$txtColor = $_COOKIE['txtColor'];
}
?>
<!-- HTML Page-->
<html>
<body bgcolor="<?php echo $bgColor ?>" text="<?php echo $txtColor ?>">
<form action= "<?php echo $_SERVER['PHP_SELF']; ?>" method ="POST">
<p>Body Color:</p>
<select name=bgColor>
<option value ="Red">Red</option>
<option value ="Green" selected>Green</option>
<option value ="Blue">Blue</option>
<option value ="Yellow">Yellow</option>
<option value ="Black">Black</option>
<option value ="Brown">Brown</option>
<option value ="White">White</option>
</select>
<p>Text Color:</p>
<select name=txtColor>
<tion value ="Red">Red</option>
<option value ="Green" selected>Green</option>
<option value ="Blue">Blue</option>
<option value ="Yellow">Yellow</option>
<option value ="Black">Black</option>
<option value ="Brown">Brown</option>
<option value ="White">White</option>
</select>
<input type ="hidden" name="submitted" value="true"></br>
<input type="submit" value="remind">
</form>
</body>
</html>
up
5
cwillard at fastmail dot fm
13 years ago
If you're looking to set multiple values in your cookie (rather than setting multiple cookies) you might find these useful.

<?php
function build_cookie($var_array) {
  if (
is_array($var_array)) {
    foreach (
$var_array as $index => $data) {
     
$out.= ($data!="") ? $index."=".$data."|" : "";
    }
  }
  return
rtrim($out,"|");
}

function
break_cookie ($cookie_string) {
 
$array=explode("|",$cookie_string);
  foreach (
$array as $i=>$stuff) {
   
$stuff=explode("=",$stuff);
   
$array[$stuff[0]]=$stuff[1];
    unset(
$array[$i]);
  }
  return
$array;
}
?>
Hopefully someone finds these useful.
up
4
bocian941 at pawno dot pl
9 years ago
My 2 functions to use "live cookies":

<?php
   
function SetCookieLive($name, $value='', $expire = 0, $path = '', $domain='', $secure=false, $httponly=false)
    {
       
$_COOKIE[$name] = $value;
        return
setcookie($name, $value, $expire, $path, $domain, $secure, $httponly);
    }

    function
RemoveCookieLive($name)
    {
        unset(
$_COOKIE[$name]);
        return
setcookie($name, NULL, -1);
    }
?>
up
2
hansel at gretel dot com
13 years ago
The following code snippet combines abdullah's and Charles Martin's examples into a powerful combination function (and fixes at least one bug in the process):

<?php
 
function set_cookie_fix_domain($Name, $Value = '', $Expires = 0, $Path = '', $Domain = '', $Secure = false, $HTTPOnly = false)
  {
    if (!empty(
$Domain))
    {
     
// Fix the domain to accept domains with and without 'www.'.
     
if (strtolower(substr($Domain, 0, 4)) == 'www.'$Domain = substr($Domain, 4);
     
$Domain = '.' . $Domain;

     
// Remove port information.
     
$Port = strpos($Domain, ':');
      if (
$Port !== false$Domain = substr($Domain, 0, $Port);
    }

   
header('Set-Cookie: ' . rawurlencode($Name) . '=' . rawurlencode($Value)
                          . (empty(
$Expires) ? '' : '; expires=' . gmdate('D, d-M-Y H:i:s', $Expires) . ' GMT')
                          . (empty(
$Path) ? '' : '; path=' . $Path)
                          . (empty(
$Domain) ? '' : '; domain=' . $Domain)
                          . (!
$Secure ? '' : '; secure')
                          . (!
$HTTPOnly ? '' : '; HttpOnly'), false);
  }
?>

Basically, if the domain parameter is supplied, it is converted to support a broader range of domains.  This behavior may or may not be desireable (e.g. could be a security problem depending on the server) but it makes cookie handling oh-so-much-nicer (IMO).
up
3
Anonymous
10 years ago
A period in a cookie name (like user.name) seems to show up in the $_COOKIE array as an underscore (so user_name). This means that for example $_COOKIE["user_name"] must be used to read a cookie that has been set with setcookie("user.name" ...), which is already rather confusing.

Furthermore the variable $_COOKIE["user_name"] will retain the value set by setcookie("user.name" ...) and no amount of calling setcookie("user_name" ...) will alter this value. This is rather trivially fixed by clearing the "user.name" cookie, but it can take a while to realize this since there's only "user_name" in $_COOKIE.

Hope this saves someone some time.
up
2
stovenator at gmail dot com
13 years ago
If you are having issues with IE7 and setcookie(), be sure to verify that the cookie is set via http for http sites, and https for https site.

Also, if the time is incorrect on your server, IE7 will also disallow those cookies from being set.
up
1
isooik at gmail-antispam dot com
12 years ago
Here's a more advanced version of the php setcookie() alternative function:

<?php

   
/**
     * A better alternative (RFC 2109 compatible) to the php setcookie() function
     *
     * @param string Name of the cookie
     * @param string Value of the cookie
     * @param int Lifetime of the cookie
     * @param string Path where the cookie can be used
     * @param string Domain which can read the cookie
     * @param bool Secure mode?
     * @param bool Only allow HTTP usage?
     * @return bool True or false whether the method has successfully run
     */
   
function createCookie($name, $value='', $maxage=0, $path='', $domain='', $secure=false, $HTTPOnly=false)
    {
       
$ob = ini_get('output_buffering');

       
// Abort the method if headers have already been sent, except when output buffering has been enabled
       
if ( headers_sent() && (bool) $ob === false || strtolower($ob) == 'off' )
            return
false;

        if ( !empty(
$domain) )
        {
           
// Fix the domain to accept domains with and without 'www.'.
           
if ( strtolower( substr($domain, 0, 4) ) == 'www.' ) $domain = substr($domain, 4);
           
// Add the dot prefix to ensure compatibility with subdomains
           
if ( substr($domain, 0, 1) != '.' ) $domain = '.'.$domain;

           
// Remove port information.
           
$port = strpos($domain, ':');

            if (
$port !== false ) $domain = substr($domain, 0, $port);
        }

       
// Prevent "headers already sent" error with utf8 support (BOM)
        //if ( utf8_support ) header('Content-Type: text/html; charset=utf-8');

       
header('Set-Cookie: '.rawurlencode($name).'='.rawurlencode($value)
                                    .(empty(
$domain) ? '' : '; Domain='.$domain)
                                    .(empty(
$maxage) ? '' : '; Max-Age='.$maxage)
                                    .(empty(
$path) ? '' : '; Path='.$path)
                                    .(!
$secure ? '' : '; Secure')
                                    .(!
$HTTPOnly ? '' : '; HttpOnly'), false);
        return
true;
    }

?>

Regards,
Isaak
up
1
chris at styl dot ee
9 years ago
I was searching for a simple example of creating a cookie, storing a random number and updating it on refresh. I couldn't find one so I had to figure it out on my own....

- - - -
One thing to *NOTE* is technically you can't update a cookie, you can only overwrite it with a new one with the same name.

- - - -

This creates a random number, stores it in a cookie, then references it on refresh, checks for duplicates and does necessary correction, then stores it again, rinse and repeat...

<?php
ob_start
();
$MaxCount = 4;// set the max of the counter, in my tests "4" = (0,1,2,3) I adjusted below (+1) to get a "real" 4 (0,1,2,3,4) this is in reality 5 keys to humans, you can adjust script to eliminate "0", but my script makes use of the "0"

$random =(rand()%($MaxCount+1));//give me a random number limited by the max, adding "1" because computers start counting at "0"

if(!isset($_COOKIE['random'])){// check if random number cookie is not set
    //echo"not set";
   
setcookie('random', $random);//set the cookie for the first time
   
}else{
   
$lastRandom= $_COOKIE['random']; //hold the last number if it was set before
   
if($lastRandom == $random){//some logic to avoid repeats
    
if($random < $MaxCount){//if below max, add 1
       
$random++;
       
//echo "under the max, adding 1, ";   
   
}elseif($random >= ($MaxCount-1)){// if for some reason the random number is more than max or equal to it -1, and an additional -1 for max count in initial var (so in reality this -1 from intial max var, and -1 from $random which should be the same number)
           
$random--;
           
//echo "hit the max, subtracting 1, ";
       
}else{
       
$random++;
       
//echo "no case match, adding 1, ";   
       
}
   
//echo "(".$lastRandom.", ".$random. "), they matched initally - was it fixed?";
   
}else{
   
//echo "(".$lastRandom.", ".$random. "), they DO NOT match";
   
setcookie('random', $random);   
    }
   
//echo"is set: {$_COOKIE['random']}";
}

ob_end_flush();

?>
up
1
mike
13 years ago
Be careful of using the same cookie name in subdirectories. Setting a simple cookie

<?php setcookie("region", $_GET['set_region']); ?>

both in the root / and for instance in this case /admin/ will create 2 cookies with different paths. In reading the cookies back only the first one is read regardless of path.
up
0
Anonymous
19 days ago
Chrome versions prior to version 67 reject samesite=none cookies. And starting in Chrome version 84 samesite=none cookies without the secure attribute are also rejected. But that doesn't mean you can't set cookies on an unencrypted connection. The simple way around it is to use browser sniffing to detect samesite=none compatible browsers:

$cookie_string = 'set-cookie: name=value';

if (!preg_match('/Chrom[^ \/]+\/([0-9]+)[\.0-9]* /', $_SERVER['HTTP_USER_AGENT'], $matches) || $matches[1]>66 && $matches[1]<84) {// match samesite=none compatible browsers
    $cookie_string.= '; samesite=none';
}

header($cookie_string, false);// set cookie
up
1
Anonymous
1 year ago
I haven't seen this mentioned here and had a lot of issues (and created a lot of stupid hacks) before I figured this out.

If you have a couple of environments for example, and are trying to set cookies on two domains:

example.com (main site)
dev.example.com (dev site)

In this case your (same named) cookies will interfere with each other if you're trying to set cookies with the domain parameter. 

Simply use an empty string for the domain parameter and the cookies will refer to each host separately.

If you use the subdomain www. on the main site this won't be an issue, but without a subdomain you'll have issues with reading each others' cookies.
up
-1
niall at maranelda dot org
1 year ago
Be warned! PHP will mangle the names of incoming cookies far more than others have detailed below!

Theoretically, the following non-alphanumeric characters are allowed in a cookie name:

!#$%&'()*+-./:<>?@[]^_`{|}~

However, if you do this:

<?php
    setcookie
('!#$%&\'()*+-./:<>?@[]^_`{|}~', 123);
   
setcookie('!#$%&\'()*+-./:<>?@[^_`{|}~', 466);
   
setcookie('!#$%&\'()*+-./:<>?@]^_`{|}~', 789);
   
setcookie('!#$%&\'()*+-./:<>?@^_`{|}~', 'abc');
?>

then this:

<?php
    print_r
($_COOKIE);
?>

you get this back:

<?php
Array
(
    [!
#$%&'()*_-_/:<>?@] => Array
       
(
            [
0] => 123
       
)

    [!
#$%&'()*_-_/:<>?@_^_`{|}~] => 456
   
[!#$%&'()*_-_/:<>?@]^_`{|}~] => 789
   
[!#$%&'()*_-_/:<>?@^_`{|}~] => abc
)
?>

The rules would appear to be as follows:

- Convert all periods to underscores (as detailed below).
- Convert all plus signs to underscores.
- Convert all unmatched open square brackets to underscores.
- Square bracket pairs mean the value is an array; ignore everything after the closing square bracket.

Note that these rules are only applied by PHP when generating the $_COOKIE array; the cookie name part in the headers sent by your browser and as received by PHP are exactly as you specified above;

<?php
   
echo $_SERVER['HTTP_COOKIE'];
?>

gives

<?php
   
!#$%&'()*+-./:<>?@[]^_`{|}~=123; !#$%&'()*+-./:<>?@[^_`{|}~=456; !#$%&'()*+-./:<>?@]^_`{|}~=789; !#$%&'()*+-./:<>?@^_`{|}~=abc
?>

It would be nice if the official notes mentioned this conversion.
up
0
byz
4 years ago
exmaple with test.com;

setcookie('empty_domain','value',time()+3600,'') 
equal       test.com

setcookie('test_com_domain','value',time()+3600,'','test.com')  
equal       .test.com

setcookie('dot_test_com_domain','value',time()+3600,'','.test.com') 
equal       .test.com

ps:   .test.com   has its self    and child domain
up
0
RC
10 years ago
For those of your banging your head as to why a cookie is not present when Internet Explorer 6 prints, the explanation is quite interesting. After a bit of investigation, a cookie with an expiration time other than 0 fails to be passed from IE6 to the server when printing. A cookie with an expiration time of 0 is sent.

Therefore:

setcookie("TestCookie", $value, time()+3600); //will not be sent from Print / Print Preview in IE6

setcookie("TestCookie", $value, 0); //will be sent from Print / Print Preview in IE6

I'll let everyone figure out who's bright idea it was to not send normal expiring cookies when printing in IE6...
up
0
Anonymous
13 years ago
if you only want to do something once per unique visitor, you can test if a cookie is set, and if not, set the cookie and perform the action. This being the poorman's version, it has a problem, where if a user is blocking cookies they will appear as a first time visitor each time. What you can do to avoid this is to set a test cookie first and check that it exists. If it exists, then check to see if your second cookie has been set. If the first one is set, but the second isn't, then you know this is a first time visitor.
up
0
17 years ago
When using your cookies on a webserver that is not on the standard port 80, you should NOT include the :[port] in the "Cookie domain" parameter, since this would not be recognized correctly.
I had the issue working on a project that runs on multiple servers (development, production, etc.). One of the servers is running on a different port (together with other websites that run on the same server but on different ports).
up
-1
Anonymous
5 months ago
To add the "samesite" attribute, you can concatenate it to the path option until it gets implemented/documented properly
Eg:
<?php
    setcookie
('cookie_name', 'cookie_value', 0, '/; SameSite=strict');
?>
up
-2
apex at xepa dot nl
16 years ago
Note on setting cookies allowing access to sites:

If you are not using something "personal" from the computer that you are sending the cookie too watch out.  Via javascript it is possible to steal cookies from other users.  Thus allowing the stealer to login to your site as another user that might not have access otherwise.  Try to add something like the user's ip in the cookie and allowing access from that ip only with the stored cookie data.

[Editor's note: ... or simply use sessions. You can't be sure that the visitor will use the same IP the next visit. Not even on the next request (thanks to proxy servers)]
up
-2
adruff at gmail dot com
14 years ago
If you intend to use persistent cookies (vice session cookies that are deleted when the browser is closed) be aware:
1) Firefox appears to require that you include all paramaters, or it will ignore the expiration and treat the cookie as a session cookie
2) My version of firefox (1.5.0.6) defaults to 'keep cookies until i close firefox' , which essentially makes every cookie a session cookie. This of course sucks for devs, but i suppose is supposed to be a security feature for the end user. If the user wants to configure firefox to respect the expiration date and retain cookies beyond the session, the user must change it to 'keep cookies until they expire'.
up
-2
stuff at joneva dot de
3 years ago
How to store a cookie in php with JSON and read it in JavaScript correctly without using setcookieraw

$defaultActions = array(
                '1' => '0',
                '2' => '0',
                '3' => '0',
                '4' => '0',
                '5' => '0',
                '6' => '0',
                '7' => '0',
                '8' => '0',
                '9' => '0',
                '10' => '0'
            );
$json_str = json_encode($defaultActions);

//delete all cookies
if (isset($_SERVER['HTTP_COOKIE'])) {
    $cookies = explode(';', $_SERVER['HTTP_COOKIE']);
    foreach($cookies as $cookie) {
        $parts = explode('=', $cookie);
        $name = trim($parts[0]);
        setcookie($name, '', time()-1000);
        setcookie($name, '', time()-1000, '/');
    }
}
//setrawcookie("test", $json_str, false,"/",false);

setcookie("test", $json_str, false,"/",false);

?>

<script type="text/javascript">
   
    function getCookie(name) {
        var value = "; " + document.cookie;
        var parts = value.split("; " + name + "=");
        if (parts.length == 2)
            return parts.pop().split(";").shift();
    }
   
    console.log(decodeURIComponent(getCookie('test')));
   
</script>
up
-5
fapchat at gmail dot com
9 months ago
Instead of this:
<?php setcookie( "TestCookie", $value, strtotime( '+30 days' ) ); ?>

You can this:
<?php setcookie( "TestCookie"); ?>
To Top