PHP 8.1.0 RC 4 available for testing

htmlspecialchars_decode

(PHP 5 >= 5.1.0, PHP 7, PHP 8)

htmlspecialchars_decodeÖzel HTML öğelerini gerisin geriye karakterlere dönüştürür

Açıklama

htmlspecialchars_decode(string $dizge, int $seçenekler = ENT_QUOTES | ENT_SUBSTITUTE): string

Bu işlev htmlspecialchars() işlevinin zıddıdır. HTML öğelerini gerisin geriye karakterlere dönüştürür

Dönüştürülen öğeler: &, " (ENT_NOQUOTES belirtilmişse), ' (ENT_QUOTES belirtilmişse), < ve >.

Değiştirgeler

dizge

Kodu çözülecek dizge.

seçenekler

Kullanılan belge türünün ve tırnakların nasıl ele alınacağını belirten aşağıdaki seçenekler bitsel VEYAlanarak seçenekler değiştirgesinde belirtilebilir. ENT_QUOTES | ENT_SUBSTITUTE | ENT_HTML401 öntanımlıdır.

Sabit seçenekleri
Sabit İsmi Açıklama
ENT_COMPAT Çift tırnaklar dönüştürülür, tek tırnaklara dokunulmaz (öntanımlı)
ENT_QUOTES Hem tek hem de çift tırnaklar dönüştürülür
ENT_NOQUOTES Ne tek ne de çift tırnaklar dönüştürülür
ENT_HTML401 Kodu HTML 4.01 olarak ele alır.
ENT_XML1 Kodu XML 1 olarak ele alır.
ENT_XHTML Kodu XHTML olarak ele alır.
ENT_HTML5 Kodu HTML 5 olarak ele alır.

Dönen Değerler

Kodlaması çözülmüş dizge.

Sürüm Bilgisi

Sürüm: Açıklama
8.1.0 seçenekler değiştirgesinin öntanımlı değeri ENT_COMPAT iken ENT_QUOTES | ENT_SUBSTITUTE oldu.

Örnekler

Örnek 1 - htmlspecialchars_decode() örneği

<?php
$str 
"<p>this -&gt; &quot;</p>\n";

echo 
htmlspecialchars_decode($str);

// Burada tırnaklar dönüştürülmüyor
echo htmlspecialchars_decode($strENT_NOQUOTES);
?>

Yukarıdaki örneğin çıktısı:

<p>Bu -> "</p>
<p>Bu -> &quot;</p>

Ayrıca Bakınız

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User Contributed Notes 8 notes

up
0
thomas at xci[ignore_this]teit dot commm
13 years ago
The example for "htmlspecialchars_decode()" below sadly does not work for all PHP4 versions.

Quote from the PHP manual:
"get_html_translation_table() will return the translation table that is used internally for htmlspecialchars() and htmlentities()."

But it does NOT! At least not for PHP version 4.4.2.
This was already reported in a bug report (http://bugs.php.net/bug.php?id=25927), but it was marked as BOGUS.

Proof:
  Code:
--------------------
<?php
    var_dump
(get_html_translation_table(HTML_SPECIALCHARS,ENT_QUOTES));
   
var_dump(htmlspecialchars('\'',ENT_QUOTES));
?>
--------------------

  Output:
--------------------
array
  '"' => '&quot;'
  ''' => '&#39;'
  '<' => '&lt;'
  '>' => '&gt;'
  '&' => '&amp;'

'&#039;'
--------------------

This comment now is not to report this bug again (though I really believe it is one), but to complete the example and warn people of this pitfall.

To make sure your htmlspecialchars_decode fake for PHP4 works, you should do something like this:

<?php
   
function htmlspecialchars_decode($string,$style=ENT_COMPAT)
    {
       
$translation = array_flip(get_html_translation_table(HTML_SPECIALCHARS,$style));
        if(
$style === ENT_QUOTES){ $translation['&#039;'] = '\''; }
        return
strtr($string,$translation);
    }
?>

Br, Thomas
up
-1
Anonymous
15 years ago
This should be the best way to do it.
(Reposted because the other one seems a bit slower and because those who used the code under called it htmlspecialchars_decode_php4)

<?php

if ( !function_exists('htmlspecialchars_decode') )
{
    function
htmlspecialchars_decode($text)
    {
        return
strtr($text, array_flip(get_html_translation_table(HTML_SPECIALCHARS)));
    }
}

?>
up
-2
or-k at or-k dot com
16 years ago
that works also with &auml; and &quot; and so on.
get_html_translation_table(HTML_ENTITIES) => offers more characters than HTML_SPECIALCHARS

function htmlspecialchars_decode_PHP4($uSTR)
{
return strtr($uSTR, array_flip(get_html_translation_table(HTML_ENTITIES, ENT_QUOTES)));
}
up
-7
pinkgothic at gmail dot com
11 years ago
Keep in mind that you should never trust user input - particularly for "mixed-bag" input containing a combination of plain text and markup or scripting code.

Why?

Well, consider someone sending '&amp;<script>alert('XSS');</script>' to your PHP script:

<?php
$var
= "&amp;<script>alert('XSS');</script>";
$var = (htmlspecialchars_decode($var) == $var) ? htmlspecialchars($var) : $var;
echo
$var;
?>

Since '&amp;' decodes into '&', (htmlspecialchars_decode($var) == $var) will be -false-, thus returning $var without that it's escaped. In consequence, the script-tags are untouched, and you've just opened yourself to XSS.

There is, unfortunately, no reliable way to determine whether HTML is escaped or not that does not come with this caveat that I know of. Rather than try and catch the case 'I've already encoded this', you are better off avoiding double-escaping by simply escaping the HTML as close to the actual output as you can muster, e.g. in the view in an MVC development structure.
up
-8
benharold at mac dot com
12 years ago
If you use `htmlspecialchars()` to change things like the ampersand (&) into it's HTML equivalent (&amp;), you might run into a situation where you mistakenly pass the same string to the function twice, resulting in things appearing on your website like, as I call it, the ampersanded amp; "&amp;". Clearly nobody want's "&amp;" on his or her web page where there is supposed to be just an ampersand. Here's a quick and easy trick to make sure this doesn't happen:

<?php

$var
= "This is a string that could be passed to htmlspecialchars multiple times.";

if (
htmlspecialchars_decode($var) == $var) {
   
$var = htmlspecialchars($var);
}

echo
$var;

?>

Now, if your dealing with text that is a mixed bag (has HTML entities and non-HTML entities) you're on your own.
up
-9
geoffers@gmail
16 years ago
[Update of previous note, having noticed I forgot to put in quote style]

PHP4 Compatible function:

<?php

function htmlspecialchars_decode_php4 ($str, $quote_style = ENT_COMPAT) {
    return
strtr($str, array_flip(get_html_translation_table(HTML_SPECIALCHARS, $quote_style)));
}

?>
up
-10
benharold at mac dot com
12 years ago
or of course:

<?php

$var
= "Blue & yellow make green.";

$var = (htmlspecialchars_decode($var) == $var) ? htmlspecialchars($var) : $var;
echo
$var; // outputs Blue &amp; yellow make green.

// you can do it a bunch of times, it still won't screw you!

$var = (htmlspecialchars_decode($var) == $var) ? htmlspecialchars($var) : $var;
$var = (htmlspecialchars_decode($var) == $var) ? htmlspecialchars($var) : $var;
echo
$var; // still outputs Blue &amp; yellow make green.

?>

Put it in a function. Add it to the method of some abstract data class.
up
-9
geoffers at gmail dot com
16 years ago
For PHP4 Compatibility:

<?php

function htmlspecialchars_decode_php4 ($str) {
    return
strtr($str, array_flip(get_html_translation_table(HTML_SPECIALCHARS)));
}

?>
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