mb_decode_numericentity

Decode HTML numeric string reference to character

&reftitle.description; `string` `mb_decode_numericentity` `string` `string` `array` `map` ``string``null```encoding`&null;

Convert numeric string reference of `string` `string` in a specified block to character.

&reftitle.parameters;

`string`

- The `string` being decoded.

`map`

- `map` is an `array` that specifies the code area to convert.

`encoding`

- &mbstring.encoding.parameter;

`is_hex`

- This parameter is not used.

&reftitle.returnvalues;

The converted `string`.

&reftitle.errors;

Throws a ValueError if `map` is not a list of &integer;s.

&reftitle.changelog;

&Version; | &Description;
8.4.0 | `mb_decode_numericentity` now throws a ValueError if `map` is not a list of &integer;s.
&mbstring.changelog.encoding-nullable;

&reftitle.examples;

### `map` example

    <?php
    $convmap = array (
       int start_code1, int end_code1, int offset1, int mask1,
       int start_code2, int end_code2, int offset2, int mask2,
       ........
       int start_codeN, int end_codeN, int offsetN, int 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.
    ?>

### `map` example escapes JavaScript string

    <?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*8, 8);
          $v = base_convert($u, 16, 10);
          if ($v < 256 && $map[$v]) {
            $encoded .= '\\x'.substr($u, 6,2);
          } 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 = [ 0x0, 0xffff, 0, 0xffff ];
    $msg = '';
    for ($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));

&reftitle.seealso;

- `mb_encode_numericentity`