PHP 8.2.0 Released!

Filtres de nettoyage

Liste des filtres de nettoyage
ID Nom Flags Description
FILTER_SANITIZE_EMAIL "email"   Supprime tous les caractères sauf les lettres, chiffres, et !#$%&'*+-=?^_`{|}~@.[].
FILTER_SANITIZE_ENCODED "encoded" FILTER_FLAG_STRIP_LOW, FILTER_FLAG_STRIP_HIGH, FILTER_FLAG_STRIP_BACKTICK, FILTER_FLAG_ENCODE_LOW, FILTER_FLAG_ENCODE_HIGH Applique l'encodage URL, et supprime ou encode les caractères spéciaux.
FILTER_SANITIZE_MAGIC_QUOTES "magic_quotes"   Applique addslashes(). (OBSOLÈte à partir de PHP 7.3.0 et SUPPRIMÉE à partir de PHP 8.0.0, utiliser FILTER_SANITIZE_ADD_SLASHES à la place.)
FILTER_SANITIZE_ADD_SLASHES "add_slashes"   Applique addslashes(). (Disponible à partir de PHP 7.3.0)
FILTER_SANITIZE_NUMBER_FLOAT "number_float" FILTER_FLAG_ALLOW_FRACTION, FILTER_FLAG_ALLOW_THOUSAND, FILTER_FLAG_ALLOW_SCIENTIFIC Supprime tous les caractères, sauf les chiffres, +- et éventuellement .,eE.
FILTER_SANITIZE_NUMBER_INT "number_int"   Supprime tous les caractères sauf les chiffres, et les signes plus et moins.
FILTER_SANITIZE_SPECIAL_CHARS "special_chars" FILTER_FLAG_STRIP_LOW, FILTER_FLAG_STRIP_HIGH, FILTER_FLAG_STRIP_BACKTICK, FILTER_FLAG_ENCODE_HIGH Transforme en entité HTML les caractères '"<>& et les caractères ASCII de valeur inférieur à 32, et supprime ou encode les autres caractères spéciaux.
FILTER_SANITIZE_FULL_SPECIAL_CHARS "full_special_chars" FILTER_FLAG_NO_ENCODE_QUOTES, Équivaut à appeler la fonction htmlspecialchars() avec le jeu ENT_QUOTES. L'encodage des guillemets peut être désactivé en utilisant la constante FILTER_FLAG_NO_ENCODE_QUOTES. Comme la fonction htmlspecialchars(), ce filtre tient compte du default_charset et si une séquence d'octets est détectée contenant un caractère invalide dans le jeu de caractères courant, alors la chaîne entière sera rejetée et une chaîne vide sera retournée.
FILTER_SANITIZE_STRING "string" FILTER_FLAG_NO_ENCODE_QUOTES, FILTER_FLAG_STRIP_LOW, FILTER_FLAG_STRIP_HIGH, FILTER_FLAG_STRIP_BACKTICK, FILTER_FLAG_ENCODE_LOW, FILTER_FLAG_ENCODE_HIGH, FILTER_FLAG_ENCODE_AMP Supprime les balises et transforme en entité HTML les guillemets simple et double, optionnellement supprime ou encode les caractères spéciaux. Encodage des guillemets peut être désactiver en définissant FILTER_FLAG_NO_ENCODE_QUOTES. (Obsolète à partir de PHP 8.1.0, utilisez htmlspecialchars() à la place)
FILTER_SANITIZE_STRIPPED "stripped"   Alias du filtre "string". (Obsolète à partir de PHP 8.1.0, utilisez htmlspecialchars() à la place)
FILTER_SANITIZE_URL "url"   Supprime tous les caractères sauf les lettres, chiffres et $-_.+!*'(),{}|\\^~[]`<>#%";/?:@&=.
FILTER_UNSAFE_RAW "unsafe_raw" FILTER_FLAG_STRIP_LOW, FILTER_FLAG_STRIP_HIGH, FILTER_FLAG_STRIP_BACKTICK, FILTER_FLAG_ENCODE_LOW, FILTER_FLAG_ENCODE_HIGH, FILTER_FLAG_ENCODE_AMP Ne fait rien, supprime ou encode les caractères spéciaux. Ce filtre est aussi un alias pour FILTER_DEFAULT.

Avertissement

Lorsque vous utilisez ces filtres comme filtres par défaut, le drapeau par défaut est réglé sur FILTER_FLAG_NO_ENCODE_QUOTES. Vous devez mettre filter.default_flags à 0 explicitement pour que les quotes soient encodées par défaut. Comme ceci:

Exemple #1 Configurer le filtre par défaut pour agir comme htmlspecialchars

filter.default = full_special_chars
filter.default_flags = 0

Historique

Version Description
8.1.0 FILTER_SANITIZE_STRING et FILTER_SANITIZE_STRIPPED ont été dépréciés.
8.0.0 FILTER_SANITIZE_MAGIC_QUOTES a été supprimée.
7.3.0 FILTER_SANITIZE_ADD_SLASHES a été ajouté comme remplacement pour FILTER_SANITIZE_MAGIC_QUOTES
7.3.0 FILTER_SANITIZE_MAGIC_QUOTES a été rendu obsolète.

add a note

User Contributed Notes 15 notes

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60
Anonymous
7 years ago
FILTER_SANITIZE_STRING doesn't behavior the same as strip_tags function.    strip_tags allows less than symbol inferred from context, FILTER_SANITIZE_STRING strips regardless.
<?php
$smaller
= "not a tag < 5";
echo
strip_tags($smaller);    // -> not a tag < 5
echo filter_var ( $smaller, FILTER_SANITIZE_STRING); // -> not a tag
?>
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58
googlybash24 at aol dot com
10 years ago
Remember to trim() the $_POST before your filters are applied:

<?php

// We trim the $_POST data before any spaces get encoded to "%20"

// Trim array values using this function "trim_value"
function trim_value(&$value)
{
   
$value = trim($value);    // this removes whitespace and related characters from the beginning and end of the string
}
array_filter($_POST, 'trim_value');    // the data in $_POST is trimmed

$postfilter =    // set up the filters to be used with the trimmed post array
   
array(
           
'user_tasks'                        =>    array('filter' => FILTER_SANITIZE_STRING, 'flags' => !FILTER_FLAG_STRIP_LOW),    // removes tags. formatting code is encoded -- add nl2br() when displaying
           
'username'                            =>    array('filter' => FILTER_SANITIZE_ENCODED, 'flags' => FILTER_FLAG_STRIP_LOW),    // we are using this in the url
           
'mod_title'                            =>    array('filter' => FILTER_SANITIZE_ENCODED, 'flags' => FILTER_FLAG_STRIP_LOW),    // we are using this in the url
       
);

$revised_post_array = filter_var_array($_POST, $postfilter);    // must be referenced via a variable which is now an array that takes the place of $_POST[]
echo (nl2br($revised_post_array['user_tasks']));    //-- use nl2br() upon output like so, for the ['user_tasks'] array value so that the newlines are formatted, since this is our HTML <textarea> field and we want to maintain newlines
?>
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31
Willscrlt
6 years ago
To include multiple flags, simply separate the flags with vertical pipe symbols.

For example, if you want to use filter_var() to sanitize $string with FILTER_SANITIZE_STRING and pass in FILTER_FLAG_STRIP_HIGH and FILTER_FLAG_STRIP_LOW, just call it like this:

$string = filter_var($string, FILTER_SANITIZE_STRING, FILTER_FLAG_STRIP_HIGH | FILTER_FLAG_STRIP_LOW);

The same goes for passing a flags field in an options array in the case of using callbacks.

$var = filter_var($string, FILTER_SANITIZE_SPECIAL_CHARS,
array('flags' => FILTER_FLAG_STRIP_LOW | FILTER_FLAG_ENCODE_HIGH));

Thanks to the Brain Goo blog at popmartian.com/tipsntricks/for this info.
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9
ipse at sergiosantos dot me
2 years ago
Although it's specifically mentioned in the above documentation, because many seem to find this unintuitive it's worth pointing out that FILTER_SANITIZE_NUMBER_FLOAT will remove the decimal character unless you specify FILTER_FLAG_ALLOW_FRACTION:

<?php
$number_string
= '12.34';

echo
filter_var( $number_string, FILTER_SANITIZE_NUMBER_FLOAT ); // 1234

echo filter_var( $number_string, FILTER_SANITIZE_NUMBER_FLOAT, FILTER_FLAG_ALLOW_FRACTION ); // 12.34
?>
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22
marcus at synchromedia dot co dot uk
13 years ago
It's not entirely clear what the LOW and HIGH ranges are. LOW is characters below 32, HIGH is those above 127, i.e. outside the ASCII range.

<?php
$a
= "\tcafé\n";
//This will remove the tab and the line break
echo filter_var($a, FILTER_SANITIZE_STRING, FILTER_FLAG_STRIP_LOW);
//This will remove the é.
echo filter_var($a, FILTER_SANITIZE_STRING, FILTER_FLAG_STRIP_HIGH);
?>
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13
AntonioPrimera
6 years ago
Please be aware that when using filter_var() with FILTER_SANITIZE_NUMBER_FLOAT and FILTER_SANITIZE_NUMBER_INT the result will be a string, even if the input value is actually a float or an int.

Use FILTER_VALIDATE_FLOAT and FILTER_VALIDATE_INT, which will convert the result to the expected type.
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9
galvao at galvao dot eti dot br
9 years ago
Just to clarify, since this may be unknown for a lot of people:

ASCII characters above 127 are known as "Extended" and they represent characters such as greek letters and accented letters in latin alphabets, used in languages such as pt_BR.

A good ASCII quick reference (aside from the already mentioned Wikipedia article) can be found at: http://www.asciicodes.com/
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5
david dot drakulovski at gmail dot com
8 years ago
Here is a simpler and a better presented ASCII list for the <32 or 127> filters
(if wikipedia confused the hell out of you):

http://www.danshort.com/ASCIImap/
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0
darren at daz-web dot com
4 years ago
For those looking for a simple way around filtering POST forms that have textarea elements in them. If you also need tab for example you can extend quite easily.

<?php
//create an array of all relevant textareas
$textareas = array("ta1");

foreach(
$_POST as $k => $v)
    {
       
$v = trim($v);//so we are sure it is whitespace free at both ends
   
        //preserve newline for textarea answers
       
if(in_array($k,$textareas))$v=str_replace("\n","[NEWLINE]",$v);
   
       
//sanitise string
       
$v = filter_var($v, FILTER_SANITIZE_STRING, FILTER_FLAG_STRIP_LOW | FILTER_FLAG_STRIP_HIGH | FILTER_FLAG_STRIP_BACKTICK);
   
       
//now replace the placeholder with the original newline
       
$_POST[$k] = str_replace("[NEWLINE]","\n",$v);
    }

//simple form for testing submital

?><!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Filter test</title>
</head>

<body>
   
<form action="" method="post">
    <p>
        <textarea name="ta1" cols="30" rows="10"><?php echo $_POST['ta1']; ?></textarea>
    </p>
    <p>
        <input type="text" name="txt1" size="30" value="<?php echo $_POST['txt1']; ?>" />
    </p>
    <p>
        <input type="submit" />   
    </p>
    </form>

</body>
   
</html>
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-5
adellemfrank at hotmail dot com
10 years ago
A good list of which ASCII characters are < 32 and > 127 can be found at: http://en.wikipedia.org/wiki/ASCII#ASCII_printable_characters
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-5
Rodrigo Guariento
2 years ago
To get ONLY numbers from a string use this code:
    echo preg_replace('/[^0-9]/', '', '123456-789');
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-4
Anonymous
2 years ago
<?php
/*
     filter all ascii and save juste 0-9 a-Z and @ . _
*/

echo alphanum('abcdefghABCDEFGH0123456789/!:;@._');
// return abcdefghABCDEFGH0123456789@._

function alphanum( $string , $x=''){
       
$h=strlen($string);
        for(
$a=0; $a<$h; $a++) {
           
$i = ord($string[$a]);
            if(
                (
$i==46) || // .
               
($i==64) || // @
               
($i==95) || // _
               
($i > 47 && $i < 58) || //0123456789
               
($i > 64 && $i < 91) || //ABCDEFGH..Z
               
($i > 96 && $i < 123)   //abcdefgh..z
            
) { $x .= $string[$a]; }   
        }
        return
$x;
    }

?>
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-19
Anonymous
9 years ago
Support for FILTER_SANITIZE_FULL_SPECIAL_CHARS was added from version 5.3.3
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-7
anonymous
2 years ago
In the "FILTER_SANITIZE_URL" section where it says, "Remove all characters except letters, digits and $-_.+!*'(),{}|\\^~[]`<>#%";/?:@&=." is there a reason why there is a double backslash (\\)? Shouldn't there only be one backslash if it's saying that backslashes are allowed?
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-35
Dmitry Snytkine
11 years ago
Beware that FILTER_FLAG_STRIP_LOW strips NEWLINE and TAG and CARRIAGE RETURN chars. If you have a form that accepts user input in plaintext format, all the submitted text will lose all the line breaks, making it appear all on one line. This basically renders this filter useless for parsing user-submitted text, even in plain text.
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