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<?php $text = '\x5Bli\x5DLevel\x3A\x2023\x5B\x2Fli\x5D'; var_dump(json_decode($text, true)); var_dump(html_entity_decode($text, ENT_QUOTES, 'UTF-8'));
Output for 5.6.0 - 5.6.40, 7.0.0 - 7.0.33, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
NULL string(39) "\x5Bli\x5DLevel\x3A\x2023\x5B\x2Fli\x5D"

preferences:
189.02 ms | 403 KiB | 287 Q