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html_entity_decode
Convert all HTML entities to their applicable characters
(PHP 4 >= 4.3.0, PHP 5)
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.
Parameters
- string
The input string.
- quote_style
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:Table 309. Available quote_style constants
Constant Name Description ENT_COMPATWill convert double-quotes and leave single-quotes alone. ENT_QUOTESWill convert both double and single quotes. ENT_NOQUOTESWill leave both double and single quotes unconverted.
- charset
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.
Table 310. 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
Note:Any other character sets are not recognized and ISO-8859-1 will be used instead.
Examples
Example 2412. 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
?>
Notes
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.