mb_decode_numericentity

(PHP 4 >= 4.0.6, PHP 5, PHP 7)

mb_decode_numericentity根据 HTML 数字字符串解码成字符

说明

mb_decode_numericentity ( string $str , array $convmap [, string $encoding = mb_internal_encoding() ] ) : string

将数字字符串的引用str 按指定的字符块转换成字符串。

参数

str

要解码的 string

convmap

convmap 是一个 array,指定了要转换的代码区域。

encoding

encoding 参数为字符编码。如果省略,则使用内部字符编码。

返回值

转换后的字符串

范例

Example #1 convmap 例子

<?php
$convmap 
= array (
   
int start_code1int end_code1int offset1int mask1,
   
int start_code2int end_code2int offset2int mask2,
   ........
   
int start_codeNint end_codeNint offsetNint maskN );
// Specify Unicode value for start_codeN and end_codeN
// Add offsetN to value and take bit-wise 'AND' with maskN, 
// then convert value to numeric string reference.
?>

参见

Example #2 convmap 的例子: 编码(escape) JavaScript 字符串

<?php
function escape_javascript_string($str) {
  
$map = [
          
1,1,1,1,1,1,1,1,1,1,
          
1,1,1,1,1,1,1,1,1,1,
          
1,1,1,1,1,1,1,1,1,1,
          
1,1,1,1,1,1,1,1,1,1,
          
1,1,1,1,1,1,1,1,0,0// 49
          
0,0,0,0,0,0,0,0,1,1,
          
1,1,1,1,1,0,0,0,0,0,
          
0,0,0,0,0,0,0,0,0,0,
          
0,0,0,0,0,0,0,0,0,0,
          
0,1,1,1,1,1,1,0,0,0// 99
          
0,0,0,0,0,0,0,0,0,0,
          
0,0,0,0,0,0,0,0,0,0,
          
0,0,0,1,1,1,1,1,1,1,
          
1,1,1,1,1,1,1,1,1,1,
          
1,1,1,1,1,1,1,1,1,1// 149
          
1,1,1,1,1,1,1,1,1,1,
          
1,1,1,1,1,1,1,1,1,1,
          
1,1,1,1,1,1,1,1,1,1,
          
1,1,1,1,1,1,1,1,1,1,
          
1,1,1,1,1,1,1,1,1,1// 199
          
1,1,1,1,1,1,1,1,1,1,
          
1,1,1,1,1,1,1,1,1,1,
          
1,1,1,1,1,1,1,1,1,1,
          
1,1,1,1,1,1,1,1,1,1,
          
1,1,1,1,1,1,1,1,1,1// 249
          
1,1,1,1,1,1,1// 255
          
];
  
// Char encoding is UTF-8
  
$mblen mb_strlen($str'UTF-8');
  
$utf32 bin2hex(mb_convert_encoding($str'UTF-32''UTF-8'));
  for (
$i=0$encoded=''$i $mblen$i++) {
      
$u substr($utf32$i*88);
      
$v base_convert($u1610);
      if (
$v 256 && $map[$v]) {
        
$encoded .= '\\x'.substr($u6,2);
      } else if (
$v == 2028) {
        
$encoded .= '\\u2028';
      } else if (
$v == 2029) {
        
$encoded .= '\\u2029';
      } else {
        
$encoded .= mb_convert_encoding(hex2bin($u), 'UTF-8''UTF-32');
      }
   }
   return 
$encoded;
}
 
// Test data
$convmap = [ 0x00xffff00xffff ];
$msg '';
for (
$i=0$i 1000$i++) {
  
// chr() cannot generate correct UTF-8 data larger value than 128, use mb_decode_numericentity().
  
$msg .= mb_decode_numericentity('&#'.$i.';'$convmap'UTF-8');
}
 
// var_dump($msg);
var_dump(escape_javascript_string($msg));

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User Contributed Notes 3 notes

up
0
fernandosilveira at yahoo dot com dot br
4 months ago
Be careful!
In addition to translate numeric entities to chars on specified target encoding, this function encodes every character from input string to the specified target encodin, even if the characters are outside the range defined by the conversion map.
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0
donovan at conduit it
14 years ago
note that at this time it seems that mb_decode_numericentity() only works with decimal entities and not hexadecimal entities.  This fact would have saved me a good hour of time in debugging.

For those who need to convert hex entities try first converting them all to decimal entities with a combination of the preg_replace() and hexdec() functions.
up
0
dev at glossword info
16 years ago
Just two great functions for daily use:

/* Converts any HTML-entities into characters */
function my_numeric2character($t)
{
    $convmap = array(0x0, 0x2FFFF, 0, 0xFFFF);
    return mb_decode_numericentity($t, $convmap, 'UTF-8');
}
/* Converts any characters into HTML-entities */
function my_character2numeric($t)
{
    $convmap = array(0x0, 0x2FFFF, 0, 0xFFFF);
    return mb_encode_numericentity($t, $convmap, 'UTF-8');
}
print my_numeric2character('&#8217; &#7936; &#226;');
print my_character2numeric(' ');
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