Php/docs/function.html-entity-decode

• PHP Manual
• 字符串 函数
• Convert HTML entities to their corresponding characters

html_entity_decode

(PHP 4 >= 4.3.0, PHP 5, PHP 7)

html_entity_decode — Convert HTML entities to their corresponding characters

说明

html_entity_decode ( string $string [, int $flags = ENT_COMPAT [, string|null $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.

参数

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_COMPAT | ENT_HTML401.

Available flags 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.
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

An optional argument defining the encoding used when converting characters.

If omitted, the default value of the encoding varies depending on the PHP version in use. In PHP 5.6 and later, the default_charset configuration option is used as the default value. PHP 5.4 and 5.5 will use UTF-8 as the default. Earlier versions of PHP use ISO-8859-1.

Although this argument is technically optional, you are highly encouraged to specify the correct value for your code if you are using PHP 5.5 or earlier, or if your default_charset configuration option may be set incorrectly for the given input.

支持以下字符集：

支持的字符集列表

字符集	别名	描述
ISO-8859-1	ISO8859-1	西欧，Latin-1
ISO-8859-5	ISO8859-5	Little used cyrillic charset (Latin/Cyrillic).
ISO-8859-15	ISO8859-15	西欧，Latin-9。增加欧元符号，法语和芬兰语字母在 Latin-1(ISO-8859-1) 中缺失。
UTF-8		ASCII 兼容的多字节 8 位 Unicode。
cp866	ibm866, 866	DOS 特有的西里尔编码。本字符集在 4.3.2 版本中得到支持。
cp1251	Windows-1251, win-1251, 1251	Windows 特有的西里尔编码。本字符集在 4.3.2 版本中得到支持。
cp1252	Windows-1252, 1252	Windows 特有的西欧编码。
KOI8-R	koi8-ru, koi8r	俄语。本字符集在 4.3.2 版本中得到支持。
BIG5	950	繁体中文，主要用于中国台湾省。
GB2312	936	简体中文，中国国家标准字符集。
BIG5-HKSCS		繁体中文，附带香港扩展的 Big5 字符集。
Shift_JIS	SJIS, 932	日语
EUC-JP	EUCJP	日语
MacRoman		Mac OS 使用的字符串。
		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.

Note:

其他字符集没有认可。将会使用默认编码并抛出异常。

返回值

Returns the decoded string.

更新日志

版本	说明
8.0.0	encoding is nullable now.

范例

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 &quot;walk&quot; the &lt;b&gt;dog&lt;/b&gt; nowecho $b; // I'll "walk" the <b>dog</b> now?>

注释

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 encoding.

参见

• htmlentities() - 将字符转换为 HTML 转义字符
• htmlspecialchars() - 将特殊字符转换为 HTML 实体
• get_html_translation_table() - 返回使用 htmlspecialchars 和 htmlentities 后的转换表
• urldecode() - 解码已编码的 URL 字符串