How to Convert Unicode Escape Sequences to UTF-8 Characters in PHP?

Unicode Escape Sequences to UTF-8 Characters in PHP

This question provides a solution for decoding Unicode escape sequences like "u00ed" to their corresponding UTF-8 encoded characters in PHP. The user mentions that finding similar questions hasn't yielded satisfactory results.

To address this, the answer offers two preg_replace_callback functions. The first function handles Unicode escape sequences based on UCS-2BE:

$str = preg_replace_callback('/\\u([0-9a-fA-F]{4})/', function ($match) {
    return mb_convert_encoding(pack('H*', $match[1]), 'UTF-8', 'UCS-2BE');
}, $str);

If the Unicode escape sequences are based on UTF-16BE, such as in C/C /Java/Json, the second function can be used:

$str = preg_replace_callback('/\\u([0-9a-fA-F]{4})/', function ($match) {
    return mb_convert_encoding(pack('H*', $match[1]), 'UTF-8', 'UTF-16BE');
}, $str);

By utilizing these functions, the Unicode escape sequences can be successfully decoded to their corresponding UTF-8 encoded characters.

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