html_entity_decode()

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

将HTML实体转换为相应的字符

说明

html_entity_decode()is the opposite ofhtmlentities()in that it converts HTML entities in the$stringto 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

The input string.

A bitmask of one or more of the following flags, which specify how to handle quotes and which document type to use. The default isENT_COMPAT | ENT_HTML401.

An optional argument defining the encoding used when converting characters.

If omitted, the default value of the$encodingvaries depending on the PHP version in use. In PHP 5.6 and later,thedefault_charsetconfiguration option is used as the default value. PHP 5.4 and 5.5 will useUTF-8as the default. Earlier versions of PHP useISO-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 yourdefault_charsetconfiguration option may be set incorrectly for the given input.

支持以下字符集：

返回值

Returns the decoded string.

更新日志

范例

Decoding HTML entities

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 bytrim())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

If you need something that converts [0-9]+ entities to UTF-8, this is simple and works:

Use the following to decode all entities:

I've checked these special entities: 
- double quotes (")
- single quotes (' and ') 
- non printable chars (e.g. 
)
With other $flags some or all won't be decoded.
It seems that ENT_XML1 and ENT_XHTML are identical when decoding.

I wanted to use this function today and I found the documentation, especially about the flags, not particularly helpful.
Running the code below, for example, failed because the flag I used was the wrong one...
$string = 'Donna's Bakery';
$title = html_entity_decode($string, ENT_HTML401, 'UTF-8');
echo $title;
The correct flag to use in this case is ENT_QUOTES.
My understanding of the flag to use is the one that would correspond to the expected, converted outcome. So, ENT_QUOTES for a character that would be a single or double quote when converted... and so on.
Please help make the documentation a bit clearer.

This functionality is now implemented in the PEAR package PHP_Compat.
More information about using this function without upgrading your version of PHP can be found on the below link:
http://pear.php.net/package/PHP_Compat

The following function decodes named and numeric HTML entities and works on UTF-8. Requires iconv.
function decodeHtmlEnt($str) {
  $ret = html_entity_decode($str, ENT_COMPAT, 'UTF-8');
  $p2 = -1;
  for(;;) {
    $p = strpos($ret, '', $p2+1);
    if ($p === FALSE)
      break;
    $p2 = strpos($ret, ';', $p);
    if ($p2 === FALSE)
      break;
      
    if (substr($ret, $p+2, 1) == 'x')
      $char = hexdec(substr($ret, $p+3, $p2-$p-3));
    else
      $char = intval(substr($ret, $p+2, $p2-$p-2));
      
    //echo "$char\n";
    $newchar = iconv(
      'UCS-4', 'UTF-8',
      chr(($char>>24)&0xFF).chr(($char>>16)&0xFF).chr(($char>>8)&0xFF).chr($char&0xFF) 
    );
    //echo "$newchar

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