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html_entity_decode (PHP 4 >= 4.3.0, PHP 5) html_entity_decode --
Convert all HTML entities to their applicable characters
Descriptionstring html_entity_decode ( string string [, int quote_style [, string charset]] )
html_entity_decode() is the opposite of
htmlentities() in that it converts all HTML entities
to their applicable characters from string.
The optional second quote_style parameter lets
you define what will be done with 'single' and "double" quotes. It takes
on one of three constants with the default being
ENT_COMPAT:
表格 1. Available quote_style constants Constant Name | Description |
---|
ENT_COMPAT | Will convert double-quotes and leave single-quotes alone. | ENT_QUOTES | Will convert both double and single quotes. | ENT_NOQUOTES | Will leave both double and single quotes unconverted. |
The ISO-8859-1 character set is used as default for the optional third
charset. This defines the character set used in
conversion.
PHP 4.3.0 及其后续版本支持如下字符集。
表格 2. 已支持字符集 字符集 | 别名 | 描述 |
---|
ISO-8859-1 | ISO8859-1 |
西欧,Latin-1
| ISO-8859-15 | ISO8859-15 |
西欧,Latin-9。增加了 Latin-1(ISO-8859-1)中缺少的欧元符号、法国及芬兰字母。
| UTF-8 | |
ASCII 兼容多字节 8-bit Unicode。
| cp866 | ibm866, 866 |
DOS-特有的 Cyrillic 字母字符集。PHP 4.3.2 开始支持该字符集。
| cp1251 | Windows-1251, win-1251, 1251 |
Windows-特有的 Cyrillic 字母字符集。PHP 4.3.2 开始支持该字符集。
| cp1252 | Windows-1252, 1252 |
Windows 对于西欧特有的字符集。
| KOI8-R | koi8-ru, koi8r |
俄文。PHP 4.3.2 开始支持该字符集。
| BIG5 | 950 |
繁体中文,主要用于中国台湾。
| GB2312 | 936 |
简体中文,国际标准字符集。
| BIG5-HKSCS | |
繁体中文,Big5 的延伸,主要用于香港。
| Shift_JIS | SJIS, 932 |
日文。
| EUC-JP | EUCJP |
日文。
|
注:
ISO-8859-1 将代替任何其它无法识别的字符集。
注:
This function doesn't support multi-byte character sets in PHP < 5.
例子 1. Decoding HTML entities
<?php $orig = "I'll \"walk\" the <b>dog</b> now";
$a = htmlentities($orig);
$b = html_entity_decode($a);
echo $a; // I'll "walk" the <b>dog</b> now
echo $b; // I'll "walk" the <b>dog</b> now
// For users prior to PHP 4.3.0 you may do this: function unhtmlentities($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); return strtr($string, $trans_tbl); }
$c = unhtmlentities($a);
echo $c; // I'll "walk" the <b>dog</b> now
?>
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注:
You might wonder why trim(html_entity_decode(' ')); doesn't
reduce the string to an empty string, that's because the ' '
entity is not ASCII code 32 (which is stripped by
trim()) but ASCII code 160 (0xa0) in the default ISO
8859-1 characterset.
See also htmlentities(),
htmlspecialchars(),
get_html_translation_table(),
and urldecode().
jojo
04-Nov-2006 12:27
The decipherment does the character encoded by the escape function of JavaScript.
When the multi byte is used on the page, it is effective.
javascript escape('aaaa') ..... 'aa%u3042%u3042aa'
php jsEscape_decode('aa%u3042%u3042aa')..'aaaa'
<?
function jsEscape_decode($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
02-Sep-2006 05:15
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 06:09
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
$trans_table['''] = "'";
as it would override the quote_style setting and thus lead to unexpected results for quote_styles ENT_NOQUOTES and ENT_COMPAT.
grvg (at) free (dot) fr
30-Jul-2006 12:44
Here is the ultimate functions to convert HTML entities to UTF-8:
The main function ishtmlentities2utf8
Others are helper functions
function chr_utf8($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 $string;
}
nycolhas at hotmail dot com
06-Apr-2006 02:24
This function might be useful for people who want to capitalize a string using html entities.
<?php
function htmlstrtoupper(&$string) {
return htmlentities(strtoupper(html_entity_decode(&$string)));
}
?>
buraks78 at gmail dot com
08-Feb-2006 07:19
The "unhtmlentities" function defined above fails to decode single quotes properly. The issue can be solved by putting double quotes around replacing chr(\\1) with chr("\\1")...
function unhtmlentities($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);
return strtr($string, $trans_tbl);
}
hurricane at cyberworldz dot org
23-Dec-2005 12:33
I shortened the function repace_num_entity a bit to make more understandable and clean. Maybe now someone sees the problem it possibly has... (as mentioned below)
<?php
function replace_num_entity($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 $ret;
}
?>
loufoque
09-Oct-2005 04:15
If you want to decode NCRs to utf-8 use this function instead of chr().
function utf8_chr($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 08:22
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 06:43
Note that
<?php
echo urlencode(html_entity_decode(" "));
?>
will output "%A0" instead of "+".
gaui at gaui dot is
05-Jul-2005 08:15
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['''] = "'";
return ( strtr( $given_html, $trans_table ) );
}
}
marius (at) hot (dot) ee
08-Apr-2005 09:40
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, $ttr);
php dot net at c dash ovidiu dot tk
18-Mar-2005 04:37
Quick & dirty code that translates numeric entities to UTF-8.
<?php
function replace_num_entity($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 čא test'';
echo $test . "<br />\n";
echo preg_replace_callback('/&#([0-9a-fx]+);/mi', 'replace_num_entity', $test);
?>
Silvan
29-Jan-2005 11:33
Passing NULL or FALSE as a string will generate a '500 Internal Server Error' (or break the script when inside a function).
So always test your string first before passing it to html_entity_decode().
daniel at brightbyte dot de
14-Nov-2004 10:12
This function seems to have to have two limitations (at least in PHP 4.3.8):
a) it does not work with multibyte character codings, such as UTF-8
b) it does not decode numeric entity references
a) can be solved by using iconv to convert to ISO-8859-1, then decoding the entities, than convert to UTF-8 again. But that's quite ugly and detroys all characters not present in Latin-1.
b) can be solved rather nicely using the following code:
<?php
function decode_entities($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
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