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html_entity_decode

(PHP 4 >= 4.3.0, PHP 5, PHP 7)

html_entity_decode — 모든 HTML 엔티티를 해당하는 문자로 변환

설명

string html_entity_decode ( string $string [, int $quote_style [, string $charset ]] )

html_entity_decode()는 string의 모든 HTML 엔티티를 해당하는 문자로 변환합니다. htmlentities()의 역함수입니다.

인수

string

입력 문자열.

quote_style

선택적인 두번째 인수 quote_style은 '홑따옴표'와 "겹따옴표"를 어떻게 처리할지 정의합니다. 아래의 상수들을 사용할 수 있으며, 기본값은 ENT_COMPAT입니다:

**사용할 수 있는 `quote_style` 상수**
상수명	설명
`ENT_COMPAT`	겹따옴표만 변환합니다.
`ENT_QUOTES`	홑따옴표와 겹따옴표 모두 변환합니다.
`ENT_NOQUOTES`	홑따옴표와 겹따옴표 모두 변환하지 않습니다.

charset

선택적인 세번째 인수 charset의 기본값은 ISO-8859-1 문자셋입니다. 변환에 사용할 문자셋을 정의합니다.

PHP 4.3.0 이상에서 다음 문자셋을 지원합니다.

**지원 문자셋**
문자셋	다른 이름	설명
ISO-8859-1	ISO8859-1	서부 유럽어, Latin-1.
ISO-8859-15	ISO8859-15	서부 유럽어, Latin-9. 유로 사인, Latin-1(ISO-8859-1)에 빠진 프랑스어와 핀란드어 문자 추가.
UTF-8		아스키 호환 멀티바이트 8비트 유니코드.
cp866	ibm866, 866	DOS-특정 키릴 문자셋. 이 문자셋은 4.3.2부터 지원합니다.
cp1251	Windows-1251, win-1251, 1251	윈도우-특정 키릴 문자셋. 이 문자셋은 4.3.2부터 지원합니다.
cp1252	Windows-1252, 1252	윈도우 특정 서부 유럽어 문자셋
KOI8-R	koi8-ru, koi8r	러시아어. 이 문자셋은 4.3.2부터 지원합니다.
BIG5	950	중국어 번체, 주로 대만에서 사용.
GB2312	936	중국어 간체, 국가 표준 문자셋.
BIG5-HKSCS		홍콩 확장을 포함한 Big5, 중국어 번체.
Shift_JIS	SJIS, 932	일본어.
EUC-JP	EUCJP	일본어.

Note: 다른 문자셋에 대해서는 ISO-8859-1을 사용합니다.

반환값

디코드한 문자열을 반환합니다.

변경점

버전	설명
5.0.0	멀티바이트 문자셋 지원 추가.

예제

Example #1 HTML 엔티티 디코딩


<?php
$orig = "I'll \"walk\" the <b>dog</b> now";

$a = htmlentities($orig);

$b = html_entity_decode($a);

echo $a; // I'll &quot;walk&quot; the &lt;b&gt;dog&lt;/b&gt; now

echo $b; // I'll "walk" the <b>dog</b> now


// PHP 4.3.0 이전 사용자는 이렇게 할 수 있습니다:
function unhtmlentities($string)
{
    // 숫자 엔티티 치환
    $string = preg_replace('~&#x([0-9a-f]+);~ei', 'chr(hexdec("\\1"))', $string);
    // 문자 엔티티 치환
    $trans_tbl = get_html_translation_table(HTML_ENTITIES);
    $trans_tbl = array_flip($trans_tbl);
    return strtr($string, $trans_tbl);
}

$c = unhtmlentities($a);

echo $c; // I'll "walk" the <b>dog</b> now

?>

주의

Note:
trim(html_entity_decode(' '));는 문자열을 빈 문자열로 변환하지 않습니다. 이는 기본값인 ISO-8859-1 문자셋에서 ' ' 엔티티가 (trim()에서 잘라내는) 아스키 코드 32가 아닌, 아스키 코드 160(0xa0)이기 때문입니다.

참고

htmlentities() - 해당하는 모든 문자를 HTML 엔티티로 변환
htmlspecialchars() - 특수 문자를 HTML 엔터티로 변환
get_html_translation_table() - htmlspecialchars와 htmlentities에서 사용하는 변환표를 반환합니다
urldecode() - URL 인코드된 문자열을 디코드

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User Contributed Notes 20 notes

down

128

Martin ¶

13 years ago


If you need something that converts &#[0-9]+ entities to UTF-8, this is simple and works:



<?php

/* Entity crap. /

$input = "Fovi&#269;";



$output = preg_replace_callback("/(&#[0-9]+;)/", function($m) { return mb_convert_encoding($m[1], "UTF-8", "HTML-ENTITIES"); }, $input);



/* Plain UTF-8. */

echo $output;

?>

down

txnull ¶

9 years ago


Use the following to decode all entities:
<?php html_entity_decode($string, ENT_QUOTES | ENT_XML1, 'UTF-8') ?>

I've checked these special entities: 
- double quotes (&#34;)
- single quotes (&#39; and &apos;) 
- non printable chars (e.g. &#13;)
With other $flags some or all won't be decoded.

It seems that ENT_XML1 and ENT_XHTML are identical when decoding.

down

aidan at php dot net ¶

20 years ago


This functionality is now implemented in the PEAR package PHP_Compat.

More information about using this function without upgrading your version of PHP can be found on the below link:

http://pear.php.net/package/PHP_Compat

down

Benjamin ¶

11 years ago


The following function decodes named and numeric HTML entities and works on UTF-8. Requires iconv.

function decodeHtmlEnt($str) {
    $ret = html_entity_decode($str, ENT_COMPAT, 'UTF-8');
    $p2 = -1;
    for(;;) {
        $p = strpos($ret, '&#', $p2+1);
        if ($p === FALSE)
            break;
        $p2 = strpos($ret, ';', $p);
        if ($p2 === FALSE)
            break;
            
        if (substr($ret, $p+2, 1) == 'x')
            $char = hexdec(substr($ret, $p+3, $p2-$p-3));
        else
            $char = intval(substr($ret, $p+2, $p2-$p-2));
            
        //echo "$char\n";
        $newchar = iconv(
            'UCS-4', 'UTF-8',
            chr(($char>>24)&0xFF).chr(($char>>16)&0xFF).chr(($char>>8)&0xFF).chr($char&0xFF) 
        );
        //echo "$newchar<$p<$p2<<\n";
        $ret = substr_replace($ret, $newchar, $p, 1+$p2-$p);
        $p2 = $p + strlen($newchar);
    }
    return $ret;
}

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-1

Daniel A. ¶

6 years ago


I wanted to use this function today and I found the documentation, especially about the flags, not particularly helpful.

Running the code below, for example, failed because the flag I used was the wrong one...

$string = 'Donna&#039;s Bakery';
$title = html_entity_decode($string, ENT_HTML401, 'UTF-8');
echo $title;

The correct flag to use in this case is ENT_QUOTES.

My understanding of the flag to use is the one that would correspond to the expected, converted outcome. So, ENT_QUOTES for a character that would be a single or double quote when converted... and so on.

Please help make the documentation a bit clearer.

down

-3

Matt Robinson ¶

15 years ago


I wrote in a previous comment that html_entity_decode() only handled about 100 characters. That's not quite true; it only handles entities that exist in the output character set (the third argument). If you want to get ALL HTML entities, make sure you use ENT_QUOTES and set the third argument to 'UTF-8'. 

If you don't want a UTF-8 string, you'll need to convert it afterward with something like utf8_decode(), iconv(), or mb_convert_encoding(). 

If you're producing XML, which doesn't recognise most HTML entities:

When producing a UTF-8 document (the default), then htmlspecialchars(html_entity_decode($string, ENT_QUOTES, 'UTF-8'), ENT_NOQUOTES, 'UTF-8') (because you only need to escape < and > and & unless you're printing inside the XML tags themselves).

Otherwise, either convert all the named entities to numeric ones, or declare the named entities in the document's DTD. The full list of 252 entities can be found in the HTML 4.01 Spec, or you can cut and paste the function from my site (http://inanimatt.com/php-convert-entities.php).

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-3

php dot net at c dash ovidiu dot tk ¶

19 years ago


Quick & dirty code that translates numeric entities to UTF-8.

<?php

    function replace_num_entity($ord)
    {
        $ord = $ord[1];
        if (preg_match('/^x([0-9a-f]+)$/i', $ord, $match))
        {
            $ord = hexdec($match[1]);
        }
        else
        {
            $ord = intval($ord);
        }
        
        $no_bytes = 0;
        $byte = array();

        if ($ord < 128)
        {
            return chr($ord);
        }
        elseif ($ord < 2048)
        {
            $no_bytes = 2;
        }
        elseif ($ord < 65536)
        {
            $no_bytes = 3;
        }
        elseif ($ord < 1114112)
        {
            $no_bytes = 4;
        }
        else
        {
            return;
        }

        switch($no_bytes)
        {
            case 2:
            {
                $prefix = array(31, 192);
                break;
            }
            case 3:
            {
                $prefix = array(15, 224);
                break;
            }
            case 4:
            {
                $prefix = array(7, 240);
            }
        }

        for ($i = 0; $i < $no_bytes; $i++)
        {
            $byte[$no_bytes - $i - 1] = (($ord & (63 * pow(2, 6 * $i))) / pow(2, 6 * $i)) & 63 | 128;
        }

        $byte[0] = ($byte[0] & $prefix[0]) | $prefix[1];

        $ret = '';
        for ($i = 0; $i < $no_bytes; $i++)
        {
            $ret .= chr($byte[$i]);
        }

        return $ret;
    }

    $test = 'This is a &#269;&#x5d0; test&#39;';

    echo $test . "<br />\n";
    echo preg_replace_callback('/&#([0-9a-fx]+);/mi', 'replace_num_entity', $test);

?>

down

-4

Free at Key dot no ¶

14 years ago


Handy function to convert remaining HTML-entities into human readable chars (for entities which do not exist in target charset):



<?php

function cleanString($in,$offset=null)

{

    $out = trim($in);

    if (!empty($out))

    {

        $entity_start = strpos($out,'&',$offset);

        if ($entity_start === false)

        {

            // ideal

            return $out;    

        }

        else

        {

            $entity_end = strpos($out,';',$entity_start);

            if ($entity_end === false)

            {

                 return $out;

            }

            // zu lang um eine entity zu sein

            else if ($entity_end > $entity_start+7)

            {

                 // und weiter gehts

                 $out = cleanString($out,$entity_start+1);

            }

            // gottcha!

            else

            {

                 $clean = substr($out,0,$entity_start);

                 $subst = substr($out,$entity_start+1,1);

                 // &scaron; => "s" / &#353; => "_"

                 $clean .= ($subst != "#") ? $subst : "_";

                 $clean .= substr($out,$entity_end+1);

                 // und weiter gehts

                 $out = cleanString($clean,$entity_start+1);

            }

        }

    }

    return $out;

}

?>

down

-4

neurotic dot neu at gmail dot com ¶

14 years ago


This is a safe rawurldecode with utf8 detection:



<?php

function utf8_rawurldecode($raw_url_encoded){

    $enc = rawurldecode($raw_url_encoded);

    if(utf8_encode(utf8_decode($enc))==$enc){;

        return rawurldecode($raw_url_encoded);

    }else{

        return utf8_encode(rawurldecode($raw_url_encoded));

    }

}

?>

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-3

Anonymous ¶

3 years ago


Why doesn't the html_entity_decode() function convert entities without the last semicolon (like &#x41 or &#65) to characters? 

---
<?php
echo 'like &#x41 or &#65';
---

Browser displays fine:
----
like A or A

down

-7

me at richardsnazell dot com ¶

16 years ago


I had a problem getting the 'TM' trademark symbol to display correctly in an email subject line. Using html_entity_decode() with different charsets didn't work, but directly replacing the entity with it's ASCII equivalent did:

$subject = str_replace('&trade;', chr(153), $subject);

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-8

Victor ¶

12 years ago


We were having very peculiar behavior regarding foreign characters such as e-acute.

However, it was only showing up as a problem when extracting those characters out of our mysql database and when being displayed through a proxy server of ours that handles dns issues.

As other users have made a note of, the default character setting wasn't what they were expecting it to be when they left theirs blank.

When we changed our default_charset to "UTF-8", our problems and needs for using functions like these were no longer necessary in handling foreign characters such as e-acute. Good enough for us!

down

-5

jojo ¶

18 years ago


The decipherment does the character encoded by the escape function of JavaScript. 

When the multi byte is used on the page, it is effective. 



javascript escape('aaああaa') ..... 'aa%u3042%u3042aa'

php  jsEscape_decode('aa%u3042%u3042aa')..'aaああaa'



<?php

function jsEscape_decode($jsEscaped,$outCharCode='SJIS'){

    $arrMojis = explode("%u",$jsEscaped);

    for ($i = 1;$i < count($arrMojis);$i++){

        $c = substr($arrMojis[$i],0,4);

        $cc = mb_convert_encoding(pack('H*',$c),$outCharCode,'UTF-16');

        $arrMojis[$i] = substr_replace($arrMojis[$i],$cc,0,4);

    }

    return implode('',$arrMojis);

}

?>

down

-11

florianborn (at) yahoo (dot) de ¶

19 years ago


Note that

<?php

 echo urlencode(html_entity_decode("&nbsp;"));

?>

will output "%A0" instead of "+".

down

-9

marion at figmentthinking dot com ¶

15 years ago


I just ran into the:

Bug #27626 html_entity_decode bug - cannot yet handle MBCS in html_entity_decode()!



The simple solution if you're still running PHP 4 is to wrap the html_entity_decode() function with the utf8_decode() function.



<?php

$string = '&nbsp;';

$utf8_encode = utf8_encode(html_entity_decode($string));

?>



By default html_entity_decode() returns the ISO-8859-1 character set, and by default utf8_decode()...



http://us.php.net/manual/en/function.utf8-decode.php

"Converts a string with ISO-8859-1 characters encoded with UTF-8 to single-byte ISO-8859-1"

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-7

slickriptide at gmail dot com ¶

8 years ago


When using this function, it's a good idea to pay attention when it says that leaving the charset parameter empty is "not recommended". 

I had an issue where I was storing text files, with entities converted, into a database. When I retrieved them later and ran

$text_file = html_entity_decode($text_data);

the entities were NOT decoded.

Once I was aware of the problem, I changed the decode call to fully specify all of the parameters:

$text_file = html_entity_decode($text_data, ENT_COMPAT | ENT_HTML5,'utf-8');

This converted the entities as expected.

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-15

daniel at brightbyte dot de ¶

20 years ago


This function seems to have to have two limitations (at least in PHP 4.3.8):

a) it does not work with multibyte character codings, such as UTF-8
b) it does not decode numeric entity references

a) can be solved by using iconv to convert to ISO-8859-1, then decoding the entities, than convert to UTF-8 again. But that's quite ugly and detroys all characters not present in Latin-1.

b) can be solved rather nicely using the following code:

<?php
function decode_entities($text) {
    $text= html_entity_decode($text,ENT_QUOTES,"ISO-8859-1"); #NOTE: UTF-8 does not work!
    $text= preg_replace('/&#(\d+);/me',"chr(\\1)",$text); #decimal notation
    $text= preg_replace('/&#x([a-f0-9]+);/mei',"chr(0x\\1)",$text);  #hex notation
    return $text;
}
?>

HTH

down

-15

grvg (at) free (dot) fr ¶

18 years ago


Here is the ultimate functions to convert HTML entities to UTF-8 :

The main function is htmlentities2utf8

Others are helper functions



<?php

function chr_utf8($code)

    {

        if ($code < 0) return false;

        elseif ($code < 128) return chr($code);

        elseif ($code < 160) // Remove Windows Illegals Cars

        {

            if ($code==128) $code=8364;

            elseif ($code==129) $code=160; // not affected

            elseif ($code==130) $code=8218;

            elseif ($code==131) $code=402;

            elseif ($code==132) $code=8222;

            elseif ($code==133) $code=8230;

            elseif ($code==134) $code=8224;

            elseif ($code==135) $code=8225;

            elseif ($code==136) $code=710;

            elseif ($code==137) $code=8240;

            elseif ($code==138) $code=352;

            elseif ($code==139) $code=8249;

            elseif ($code==140) $code=338;

            elseif ($code==141) $code=160; // not affected

            elseif ($code==142) $code=381;

            elseif ($code==143) $code=160; // not affected

            elseif ($code==144) $code=160; // not affected

            elseif ($code==145) $code=8216;

            elseif ($code==146) $code=8217;

            elseif ($code==147) $code=8220;

            elseif ($code==148) $code=8221;

            elseif ($code==149) $code=8226;

            elseif ($code==150) $code=8211;

            elseif ($code==151) $code=8212;

            elseif ($code==152) $code=732;

            elseif ($code==153) $code=8482;

            elseif ($code==154) $code=353;

            elseif ($code==155) $code=8250;

            elseif ($code==156) $code=339;

            elseif ($code==157) $code=160; // not affected

            elseif ($code==158) $code=382;

            elseif ($code==159) $code=376;

        }

        if ($code < 2048) return chr(192 | ($code >> 6)) . chr(128 | ($code & 63));

        elseif ($code < 65536) return chr(224 | ($code >> 12)) . chr(128 | (($code >> 6) & 63)) . chr(128 | ($code & 63));

        else return chr(240 | ($code >> 18)) . chr(128 | (($code >> 12) & 63)) . chr(128 | (($code >> 6) & 63)) . chr(128 | ($code & 63));

    }



    // Callback for preg_replace_callback('~&(#(x?))?([^;]+);~', 'html_entity_replace', $str);

    function html_entity_replace($matches)

    {

        if ($matches[2])

        {

            return chr_utf8(hexdec($matches[3]));

        } elseif ($matches[1])

        {

            return chr_utf8($matches[3]);

        }

        switch ($matches[3])

        {

            case "nbsp": return chr_utf8(160);

            case "iexcl": return chr_utf8(161);

            case "cent": return chr_utf8(162);

            case "pound": return chr_utf8(163);

            case "curren": return chr_utf8(164);

            case "yen": return chr_utf8(165);

            //... etc with all named HTML entities

        }

        return false;

    }

    

    function htmlentities2utf8 ($string) // because of the html_entity_decode() bug with UTF-8

    {

        $string = preg_replace_callback('~&(#(x?))?([^;]+);~', 'html_entity_replace', $string);

        return $string;

    }

?>

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-13

jl dot garcia at gmail dot com ¶

15 years ago


I created this function to filter all the text that goes in or comes out of the database.



<?php

function filter_string($string, $nohtml='', $save='') {

    if(!empty($nohtml)) {

        $string = trim($string);

        if(!empty($save)) $string = htmlentities(trim($string), ENT_QUOTES, 'ISO-8859-15');

        else $string = html_entity_decode($string, ENT_QUOTES, 'ISO-8859-15');

    }

    if(!empty($save)) $string = mysql_real_escape_string($string);

    else $string = stripslashes($string);

    return($string);

}

?>

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-17

kae at verens dot com ¶

16 years ago


the references to 'chr()' in the example unhtmlentities() function should be changed to unichr, using the example unichr() function described in the 'chr' reference (http://php.net/chr).

the reason for this is characters such as &#x20AC; which do not break down into an ASCII number (that's the Euro, by the way).

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