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mb_decode_numericentity

PHP function Edit on GitHub ✎

(PHP 4 >= 4.0.6, PHP 5, PHP 7, PHP 8)

Decode HTML numeric string reference to character

Description

mb_decode_numericentity(string $string, array $map, string|null $encoding = null): string

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

Parameters

string: The string being decoded.
map: map is an array that specifies the code area to convert.
encoding: Parameter

Return Values

The converted string.

Errors/Exceptions

Throws a ValueError if map contains any value that is not an Integer, Float, Boolean, null, or a numeric string.

Changelog

Version	Description
8.4.0	The `mb_decode_numericentity()` function now throws a `ValueError` if `map` contains any value that cannot be implicitly converted to int.

Examples

map example

php

<?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

<?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));
?>