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htmlentities> <hebrevc
Last updated: Fri, 18 Jul 2008

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html_entity_decode

(PHP 4 >= 4.3.0, PHP 5)

html_entity_decode — Converte le entità HTML nei corrispondenti caratteri

Descrizione

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

La funzione html_entity_decode() è l'opposto di htmlentities() converte tutte le entità HTML presenti nel parametro string nel corrispondente carattere.

Il secondo parametro, quote_style , opzionale, indica cosa occorre fare per gli apici 'singoli' e "doppi". Sono possibili tre scelte indicate da tre costanti con default ENT_COMPAT:

Costanti disponibili per quote_style
Nome della costante Descrizione
ENT_COMPAT Converte gli apici doppi e lascia inalterati gli apici singoli.
ENT_QUOTES Converte sia gli apici doppi sia gli apici singoli.
ENT_NOQUOTES Lascia entrambi i tipi di apici inalterati.

Per il terzo parametro opzionale, charset , si utilizza come default il set di caratteri ISO-8859-1. Questo parametro indica quale set di caratteri utilizzare per la conversione.

Elenco dei set di caratteri supportati dal PHP 4.3.0 e successivi.

set di caratteri supportati
Set di caratteri Alias Descrizione
ISO-8859-1 ISO8859-1 Western European, Latin-1
ISO-8859-15 ISO8859-15 Western European, Latin-9. Con in più il simbolo dell'Euro e i caratteri francesi e finnici mancanti in Latin-1(ISO-8859-1).
UTF-8   Set ASCII compatibile con il set multi-byte Unicode su 8-bit.
cp866 ibm866, 866 Set di caratteri cirillico specifico del Dos. Supportato dalla 4.3.2.
cp1251 Windows-1251, win-1251, 1251 Set di caratteri cirillico specifico di Windows, Supportato dalla 4.3.2.
cp1252 Windows-1252, 1252 Set di caratteri specifico di Windows per l'Europa occidentale.
KOI8-R koi8-ru, koi8r Russo. Supportato dalla 4.3.2.
BIG5 950 Cinese tradizionale, usato principalmente a Taiwan.
GB2312 936 Cinese semplificato, set di caratteri nazionale standard.
BIG5-HKSCS   Big5 con estensioni per Hong Kong, cinese tradizionale.
Shift_JIS SJIS, 932 Giapponese.
EUC-JP EUCJP Giapponese.

Nota: Ogni altro set di caratteri non è riconosciuto e sarà sostituito con con il set ISO-8859-1.

Example #1 Decodifica delle entità HTML

<?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


// Per utilizzatori di versioni di PHP antecedenti alla 4.3.0:
function unhtmlentities($string) 
{
    $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

?>

Nota: Ci si può chiedere come mai la sequenza trim(html_entity_decode('&nbsp;')); non produca una stringa vuota; questo accade perchè l'intità '&nbsp;' non corrisponde al codice ASCII 32 (che verrebbe rimosso da trim()), ma, nella codifica di default ISO-8859-1, corrisponde al carattere ASCII 160 (0xa0).

Vedere anche htmlentities(), htmlspecialchars(), get_html_translation_table(), and urldecode().



htmlentities> <hebrevc
Last updated: Fri, 18 Jul 2008
 
add a note add a note User Contributed Notes
html_entity_decode
Anonymous
31-Jul-2008 06:01
You may want to specify the character set if you see unexpected behavior.  Here is an example.

# cat test.php
<?php
$str = '&#33;';
$quotes = html_entity_decode($str, ENT_QUOTES);
$noquotes = html_entity_decode($str, ENT_NOQUOTES);
$noquotesutf8 = html_entity_decode($str, ENT_NOQUOTES, 'UTF-8');
echo "quotes='$quotes', noquotes='$noquotes', noquotesutf8='$noquotesutf8'\n";
?>

# php test.php
quotes='!', noquotes='&#33;', noquotesutf8='!'
kae at verens dot com
09-May-2008 02:11
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).
me at richardsnazell dot com
21-Jan-2008 12:19
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);
Matt Robinson
22-Oct-2007 07:11
Bafflingly, html_entity_decode() only converts the 100 most common named entities, whereas the HTML 4.01 Recommendation lists over 250. This wrapper function converts all known named entities to numeric ones before handing over to the original html_entity_decode, and hopefully isn't too insufferably slow (am I right in thinking that making the conversion table static will prevent it being reinitialised on each call?)

Unfortunately it's just a little too long for this documentation. You can see the code at http://www.lazycat.org/software/html_entity_decode_full.phps
Hayley Watson
01-Oct-2007 11:15
To go further with Fabian's comment:

The XML specification (production 66) says that (decimal) numeric character references start with '&#', followed by one or more digits [0-9], and end with a ';' - just as the documented regular expression states. Hex references start with "&#x" and the allowed digits are [0-9a-fA-F].

And indeed, &#000000000000000000039; is a legitimate reference for an apostrophe (but don't tell Internet Explorer).

So Fabien's alteration to the expression is necessary. It's still insufficient, however, as chr() does not handle multibyte characters such as "&#8364;".
Hayley Watson
01-Oct-2007 10:54
Fabian's observation that chr(039) returns "a heart character" is explained by the fact that numeric literals that start with '0' are interpreted in base 8, which doesn't have a digit '9'. So 039==3 and hence chr(039) is equivalent to chr(3), NOT chr(39).
Fabian
28-Sep-2007 10:31
Actually I am not sure about the regex replacements from numeric entities back.
If you give &#039; to a browser. &#39; will also turn into a single quote.

But if I do a:
<?php
   chr(039);
?>
I will get not a single quote but a heart character (haven't seen it since DOS days :))
However
<?php
   chr(39);
?>
gives the correct result.
This makes the correct preg something like this

<?php
   $string = preg_replace('~&#x0*([0-9a-f]+);~ei', 'chr(hexdec("\\1"))', $string);
   $string = preg_replace('~&#0*([0-9]+);~e', 'chr(\\1)', $string);
?>

The reason is also already found on preg_replace manual page:
http://de.php.net/manual/en/function.preg-replace.php#69478

039 is interpreted as octal
akniep at rayo dot info
13-Jul-2007 05:39
In answer to "laurynas dot butkus at gmail dot com" and "romans@void.lv" and their great code2utf-function I added the functionality for entries between [128, 160[ that are not ASCii, but equal for all major western encodings like ISO8859-X and UTF-8 that has been mentioned before.

Now, the following function should in fact convert any number (table-entry) into an UTF-8-character. Thus, the return-value  code2utf( <number> )  equals the character that is represented by the XML-entity  &#<number>;  (exceptions: #129, #141, #143, #144, #157).

To give an example, the function may be useful for creating a UTF-8-compatible html_entity_decode-function  or  determining the entry-position of UTF-8-characters in order to find the correct entity-replacement or similar.

    function code2utf($number)
    {
        if ($number < 0)
            return FALSE;
       
        if ($number < 128)
            return chr($number);
       
        // Removing / Replacing Windows Illegals Characters
        if ($number < 160)
        {
                if ($number==128) $number=8364;
            elseif ($number==129) $number=160; // (Rayo:) #129 using no relevant sign, thus, mapped to the saved-space #160
            elseif ($number==130) $number=8218;
            elseif ($number==131) $number=402;
            elseif ($number==132) $number=8222;
            elseif ($number==133) $number=8230;
            elseif ($number==134) $number=8224;
            elseif ($number==135) $number=8225;
            elseif ($number==136) $number=710;
            elseif ($number==137) $number=8240;
            elseif ($number==138) $number=352;
            elseif ($number==139) $number=8249;
            elseif ($number==140) $number=338;
            elseif ($number==141) $number=160; // (Rayo:) #129 using no relevant sign, thus, mapped to the saved-space #160
            elseif ($number==142) $number=381;
            elseif ($number==143) $number=160; // (Rayo:) #129 using no relevant sign, thus, mapped to the saved-space #160
            elseif ($number==144) $number=160; // (Rayo:) #129 using no relevant sign, thus, mapped to the saved-space #160
            elseif ($number==145) $number=8216;
            elseif ($number==146) $number=8217;
            elseif ($number==147) $number=8220;
            elseif ($number==148) $number=8221;
            elseif ($number==149) $number=8226;
            elseif ($number==150) $number=8211;
            elseif ($number==151) $number=8212;
            elseif ($number==152) $number=732;
            elseif ($number==153) $number=8482;
            elseif ($number==154) $number=353;
            elseif ($number==155) $number=8250;
            elseif ($number==156) $number=339;
            elseif ($number==157) $number=160; // (Rayo:) #129 using no relevant sign, thus, mapped to the saved-space #160
            elseif ($number==158) $number=382;
            elseif ($number==159) $number=376;
        } //if
       
        if ($number < 2048)
            return chr(($number >> 6) + 192) . chr(($number & 63) + 128);
        if ($number < 65536)
            return chr(($number >> 12) + 224) . chr((($number >> 6) & 63) + 128) . chr(($number & 63) + 128);
        if ($number < 2097152)
            return chr(($number >> 18) + 240) . chr((($number >> 12) & 63) + 128) . chr((($number >> 6) & 63) + 128) . chr(($number & 63) + 128);
       
       
        return FALSE;
    } //code2utf()
laurynas dot butkus at gmail dot com
15-May-2007 12:24
In PHP4 html_entity_decode() is not working well with UTF-8  spitting: "Warning: cannot yet handle MBCS in html_entity_decode()!".

This is working solution combining several workarounds:

<?php
function html_entity_decode_utf8($string)
{
    static $trans_tbl;
   
    // replace numeric entities
    $string = preg_replace('~&#x([0-9a-f]+);~ei', 'code2utf(hexdec("\\1"))', $string);
    $string = preg_replace('~&#([0-9]+);~e', 'code2utf(\\1)', $string);

    // replace literal entities
    if (!isset($trans_tbl))
    {
        $trans_tbl = array();
       
        foreach (get_html_translation_table(HTML_ENTITIES) as $val=>$key)
            $trans_tbl[$key] = utf8_encode($val);
    }
   
    return strtr($string, $trans_tbl);
}

// Returns the utf string corresponding to the unicode value (from php.net, courtesy - romans@void.lv)
function code2utf($num)
{
    if ($num < 128) return chr($num);
    if ($num < 2048) return chr(($num >> 6) + 192) . chr(($num & 63) + 128);
    if ($num < 65536) return chr(($num >> 12) + 224) . chr((($num >> 6) & 63) + 128) . chr(($num & 63) + 128);
    if ($num < 2097152) return chr(($num >> 18) + 240) . chr((($num >> 12) & 63) + 128) . chr((($num >> 6) & 63) + 128) . chr(($num & 63) + 128);
    return '';
}
?>
teecee[(a)]teecee[pont]hu
13-May-2007 04:29
Hi!

The main problem with the UTF-8 strings if You try to unhtmlentities them is that the get_html_translation_table() gives back a non-UTF8 conversion table. So the idea is to get the translation table and then translate the needed non-UTF8 strings to UTF8...

I have this code working, actually this code is the one sent by 'daviscabral', just with an extra foreach in it ( http://hu.php.net/manual/en/function.htmlentities.php#68479 )

And the code is:
<?
function unhtmlentitiesUtf8($string) {
    // replace numeric entities
    $string = preg_replace('~&#x([0-9a-f]+);~ei', 'chr(hexdec("\\1"))', $string);
    $string = preg_replace('~&#([0-9]+);~e', 'chr("\\1")', $string);
    // replace literal entities
    $trans_tbl = get_html_translation_table(HTML_ENTITIES);
    $trans_tbl = array_flip($trans_tbl);
    // changing translation table to UTF-8
    foreach( $trans_tbl as $key => $value ) {
        $trans_tbl[$key] = iconv( 'ISO-8859-1', 'UTF-8', $value );
    }
    return strtr($string, $trans_tbl);
}
?>

If You need this in production code, I suggest to get the $trans_tbl into a common-includable file I think it should be faster. ( Maybe the easiest way to do this is to write after the translation: die(var_export($trans_tbl, true)); and copy&paste the source of the displaying text. And don't forget to check if the browser uses UTF8 codepage! ;)
elektronaut gmx.net
10-Jan-2007 01:11
I made my own fix to allow numerical entities in utf8 in php4...

<?
    function utf8_replaceEntity($result){
        $value = (int)$result[1];
        $string = '';
       
        $len = round(pow($value,1/8));
       
        for($i=$len;$i>0;$i--){
            $part = ($value & (255>>2)) | pow(2,7);
            if ( $i == 1 ) $part |= 255<<(8-$len);
           
            $string = chr($part) . $string;
           
            $value >>= 6;
        }
       
        return $string;
    }
   
    function utf8_html_entity_decode($string){
        return preg_replace_callback(
            '/&#([0-9]+);/u',
            'utf8_replaceEntity',
            $string
        );
    }
   
    $string = '&#8217;&#8216; &#8211; &#8220; &#8221;'
        .'&#61607; &#263; &#324; &#345;'
    ;
    $string = utf8_html_entity_decode($string,null,'UTF-8');
   
    header('Content-Type: text/html; charset=UTF-8');
    echo '<li>'.$string;
?>
inco
28-Dec-2006 08:26
@ romekt:

iconv could not be implemented, so alternatively use utf8_decode and utf8_encode to solve the utf-8 / iso-8859-1 problem
jojo
04-Nov-2006 04:27
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'

<?
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);
}
?>
romekt at CUTTHISgmail dot com
01-Sep-2006 10:15
here's a simple workaround for the UTF-8 support problem

$var=iconv("UTF-8","ISO-8859-1",$var);
$var=html_entity_decode($var, ENT_QUOTES, 'ISO-8859-1');
$var=iconv("ISO-8859-1","UTF-8",$var);
derernst at gmx dot ch
01-Aug-2006 11:09
Combining the suggestions by buraks78 at gmail dot com, gaui at gaui dot is, daniel at brightbyte dot de, and the version in PEAR_PHP_Compat, I come to the following, which should work in an UTF-8 environment, with PHP < or > 4.3:

<?php
function decode_entities($text, $quote_style = ENT_COMPAT) {
    if (function_exists('html_entity_decode')) {
        $text = html_entity_decode($text, $quote_style, 'ISO-8859-1'); // NOTE: UTF-8 does not work!
    }
    else {
        $trans_tbl = get_html_translation_table(HTML_ENTITIES, $quote_style);
        $trans_tbl = array_flip($trans_tbl);
        $text = strtr($text, $trans_tbl);
    }
    $text = preg_replace('~&#x([0-9a-f]+);~ei', 'chr(hexdec("\\1"))', $text);
    $text = preg_replace('~&#([0-9]+);~e', 'chr("\\1")', $text);
    return $text;
}
?>

Note that I omitted the line
$trans_table['&#39;'] = "'";
as it would override the quote_style setting and thus lead to unexpected results for quote_styles ENT_NOQUOTES and ENT_COMPAT.
grvg (at) free (dot) fr
29-Jul-2006 05:44
Here is the ultimate functions to convert HTML entities to UTF-8 :
The main function is htmlentities2utf8
Others are helper functions

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;
    }
hurricane at cyberworldz dot org
23-Dec-2005 04:33
I shortened the function repace_num_entity a bit to make more understandable and clean. Maybe now someone sees the problem it possibly has... (as mentioned below)

<?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($ord);
    if ($ord < 2048) $no_bytes = 2;
        else if ($ord < 65536) $no_bytes = 3;
        else if ($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;
}
?>
loufoque
08-Oct-2005 09:15
If you want to decode NCRs to utf-8 use this function instead of chr().

function utf8_chr($code)
{
    if($code<128) return chr($code);
    else if($code<2048) return chr(($code>>6)+192).chr(($code&63)+128);
    else if($code<65536) return chr(($code>>12)+224).chr((($code>>6)&63)+128).chr(($code&63)+128);
    else if($code<2097152) return chr($code>>18+240).chr((($code>>12)&63)+128)
                                  .chr(($code>>6)&63+128).chr($code&63+128));
}
emilianomartinezluque at yahoo dot com
26-Sep-2005 01:22
I've been using the great replace_num_entity function posted below. But there seems to be some problems with the 128 to 160 characters range. Ie, try:

<?php header("Content-type: text/html; charset=utf-8"); ?>
<html><body>
<?php
for($x=128; $x<161; $x++) {
      echo('&#' . $x . '; -- ' . preg_replace_callback('/&#([0-9a-fx]+);/mi', 'replace_num_entity', '&#' . $x . ';') . '</br>');
}
?>
</body></html>

I really dont know the reason for this (since according to UTF-8 specs the function should have worked) but I did a modified version of the function to address this. Hope it helps.

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($ord == 128) {
            return chr(226).chr(130).chr(172);
        } elseif($ord == 129) {
            return chr(239).chr(191).chr(189);
        } elseif($ord == 130) {
            return chr(226).chr(128).chr(154);
        } elseif($ord == 131) {
            return chr(198).chr(146);
        } elseif($ord == 132) {
            return chr(226).chr(128).chr(158);
        } elseif($ord == 133) {
            return chr(226).chr(128).chr(166);
        } elseif($ord == 134) {
            return chr(226).chr(128).chr(160);
        } elseif($ord == 135) {
            return chr(226).chr(128).chr(161);
        } elseif($ord == 136) {
            return chr(203).chr(134);
        } elseif($ord == 137) {
            return chr(226).chr(128).chr(176);
        } elseif($ord == 138) {
            return chr(197).chr(160);
        } elseif($ord == 139) {
            return chr(226).chr(128).chr(185);
        } elseif($ord == 140) {
            return chr(197).chr(146);
        } elseif($ord == 141) {
            return chr(239).chr(191).chr(189);
        } elseif($ord == 142) {
            return chr(197).chr(189);
        } elseif($ord == 143) {
            return chr(239).chr(191).chr(189);
        } elseif($ord == 144) {
            return chr(239).chr(191).chr(189);
        } elseif($ord == 145) {
            return chr(226).chr(128).chr(152);
        } elseif($ord == 146) {
            return chr(226).chr(128).chr(153);
        } elseif($ord == 147) {
            return chr(226).chr(128).chr(156);
        } elseif($ord == 148) {
            return chr(226).chr(128).chr(157);
        } elseif($ord == 149) {
            return chr(226).chr(128).chr(162);
        } elseif($ord == 150) {
            return chr(226).chr(128).chr(147);
        } elseif($ord == 151) {
            return chr(226).chr(128).chr(148);
        } elseif($ord == 152) {
            return chr(203).chr(156);
        } elseif($ord == 153) {
            return chr(226).chr(132).chr(162);
        } elseif($ord == 154) {
            return chr(197).chr(161);
        } elseif($ord == 155) {
            return chr(226).chr(128).chr(186);
        } elseif($ord == 156) {
            return chr(197).chr(147);
        } elseif($ord == 157) {
            return chr(239).chr(191).chr(189);
        } elseif($ord == 158) {
            return chr(197).chr(190);
        } elseif($ord == 159) {
            return chr(197).chr(184);
        } elseif($ord == 160) {
            return chr(194).chr(160);
        }

       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;
   }
florianborn (at) yahoo (dot) de
20-Jul-2005 11:43
Note that

<?php

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

?>

will output "%A0" instead of "+".
gaui at gaui dot is
05-Jul-2005 01:15
if( !function_exists( 'html_entity_decode' ) )
{
    function html_entity_decode( $given_html, $quote_style = ENT_QUOTES ) {
        $trans_table = array_flip(get_html_translation_table( HTML_SPECIALCHARS, $quote_style ));
        $trans_table['&#39;'] = "'";
        return ( strtr( $given_html, $trans_table ) );
       }
}
marius (at) hot (dot) ee
08-Apr-2005 02:40
To convert html entities into unicode characters, use the following:

        $trans_tbl = get_html_translation_table(HTML_ENTITIES);
        foreach($trans_tbl as $k => $v)
        {
            $ttr[$v] = utf8_encode($k);
        }
   
        $text = strtr($text, $ttr);
php dot net at c dash ovidiu dot tk
18-Mar-2005 08:37
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);

?>
Silvan
29-Jan-2005 03:33
Passing NULL or FALSE as a string will generate a '500 Internal Server Error' (or break the script when inside a function).

So always test your string first before passing it to html_entity_decode().
daniel at brightbyte dot de
14-Nov-2004 02:12
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
aidan at php dot net
14-Sep-2004 08:57
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
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Last updated: Fri, 18 Jul 2008
 
 
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