(PHP 4 >= 4.3.0, PHP 5, PHP 7, PHP 8)
html_entity_decode — Convert HTML entities to their corresponding characters
$string
, int $flags
= ENT_QUOTES | ENT_SUBSTITUTE | ENT_HTML401, ?string $encoding
= null
): string
html_entity_decode() is the opposite of
htmlentities() in that it converts HTML entities
in the string
to their corresponding characters.
More precisely, this function decodes all the entities (including all numeric entities) that a) are necessarily valid for the chosen document type — i.e., for XML, this function does not decode named entities that might be defined in some DTD — and b) whose character or characters are in the coded character set associated with the chosen encoding and are permitted in the chosen document type. All other entities are left as is.
string
The input string.
flags
A bitmask of one or more of the following flags, which specify how to handle quotes and
which document type to use. The default is ENT_QUOTES | ENT_SUBSTITUTE | ENT_HTML401
.
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. |
ENT_SUBSTITUTE |
Replace invalid code unit sequences with a Unicode Replacement Character U+FFFD (UTF-8) or � (otherwise) instead of returning an empty string. |
ENT_HTML401 |
Handle code as HTML 4.01. |
ENT_XML1 |
Handle code as XML 1. |
ENT_XHTML |
Handle code as XHTML. |
ENT_HTML5 |
Handle code as HTML 5. |
encoding
Необов'язковий параметр. Ним вказується кодування, що застосовуватиметься під час перетворення символів.
Якщо пропущено, то параметр encoding
отримає значення
директиви default_charset.
Хоча технічно цей аргумент є необов'язковим, але рекомендується вказати в коді потрібне значення, оскільки директива default_charset може бути неправильною для заданих вхідних даних.
The following character sets are supported:
Charset | Aliases | Description |
---|---|---|
ISO-8859-1 | ISO8859-1 | Western European, Latin-1. |
ISO-8859-5 | ISO8859-5 | Little used cyrillic charset (Latin/Cyrillic). |
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. |
cp1251 | Windows-1251, win-1251, 1251 | Windows-specific Cyrillic charset. |
cp1252 | Windows-1252, 1252 | Windows specific charset for Western European. |
KOI8-R | koi8-ru, koi8r | Russian. |
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, SJIS-win, cp932, 932 | Japanese |
EUC-JP | EUCJP, eucJP-win | Japanese |
MacRoman | Charset that was used by Mac OS. | |
'' |
An empty string activates detection from script encoding (Zend multibyte), default_charset and current locale (see nl_langinfo() and setlocale()), in this order. Not recommended. |
Зауваження: Any other character sets are not recognized. The default encoding will be used instead and a warning will be emitted.
Returns the decoded string.
Версія | Опис |
---|---|
8.1.0 |
flags changed from ENT_COMPAT to ENT_QUOTES | ENT_SUBSTITUTE | ENT_HTML401 .
|
8.0.0 |
encoding is nullable now.
|
Приклад #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
?>
Зауваження:
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 encoding.