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<?php var_dump(mb_strtolower('漢字', 'CP1252'));
Output for 7.4.0 - 7.4.33, 8.0.1 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
string(6) "漢字"
preferences:
116 ms | 406 KiB | 5 Q