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PHP Functions
Function: html_entity_decode (PHP 4 >= 4.3.0, PHP 5) html_entity_decode -- Convert all HTML entities to their applicable charactersDescriptionstring 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 : Table 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. Table 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 JapaneseNote: Any other character sets are not recognized and ISO-8859-1 will be used instead.
Example 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) { $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 ?>
Note: 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. Related Function(s) |