3v4l.org

run code in 300+ PHP versions simultaneously
<?php $s = 'ČeCHLOvs Ě-Š-Č-Ř-Ž-Ý-Á-Í-É-Ú-Ů'; echo $s; echo "\n\n"; echo strtolower($s); echo "\n\n"; echo mb_strtolower($s, 'UTF-8');
Output for git.master, git.master_jit, rfc.property-hooks
ČeCHLOvs Ě-Š-Č-Ř-Ž-Ý-Á-Í-É-Ú-Ů Čechlovs Ě-Š-Č-Ř-Ž-Ý-Á-Í-É-Ú-Ů čechlovs ě-š-č-ř-ž-ý-á-í-é-ú-ů

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