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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

## Description

string 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 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.

Following character sets are supported in PHP 4.3.0 and later.

表 2. Supported charsets

Charset | Aliases | Description
--- | --- | ---
ISO-8859-1 | ISO8859-1 | Western European, Latin-1
ISO-8859-15 | ISO8859-15 | Western European, Latin-9. Adds the Euro sign, French and Finnish letters missing in Latin-1(ISO-8859-1).
UTF-8 |  | ASCII compatible multi-byte 8-bit Unicode.
cp866 | ibm866, 866 | DOS-specific Cyrillic charset. This charset is supported in 4.3.2.
cp1251 | Windows-1251, win-1251, 1251 | Windows-specific Cyrillic charset. This charset is supported in 4.3.2.
cp1252 | Windows-1252, 1252 | Windows specific charset for Western European.
KOI8-R | koi8-ru, koi8r | Russian. This charset is supported in 4.3.2.
BIG5 | 950 | Traditional Chinese, mainly used in Taiwan.
GB2312 | 936 | Simplified Chinese, national standard character set.
BIG5-HKSCS |  | Big5 with Hong Kong extensions, Traditional Chinese.
Shift_JIS | SJIS, 932 | Japanese
EUC-JP | EUCJP | Japanese

> 注意: Any other character sets are not recognized and ISO-8859-1 will be used instead.

例 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 &quot;walk&quot; the &lt;b&gt;dog&lt;/b&gt; 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)
{
$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
?>`

> 注意: You might wonder why trim(html_entity_decode('&nbsp;')); doesn't reduce the string to an empty string, that's because the '&nbsp;' 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().

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