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<?php class utils { public static function replace_unicode_escape_sequence($match) { return mb_convert_encoding(pack('H*', $match[1]), 'UTF-8', 'UCS-2BE'); } } $str = '{"name":"F\u00f6retag: Betalning"}'; echo preg_replace_callback('/\\\\u([0-9a-f]{4})/i', 'utils.replace_unicode_escape_sequence', $str);
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught TypeError: preg_replace_callback(): Argument #2 ($callback) must be a valid callback, function "utils.replace_unicode_escape_sequence" not found or invalid function name in /in/lUlrd:10 Stack trace: #0 /in/lUlrd(10): preg_replace_callback('/\\\\u([0-9a-f]{4...', 'utils.replace_u...', '{"name":"F\\u00f...') #1 {main} thrown in /in/lUlrd on line 10
Process exited with code 255.

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