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run code in 300+ PHP versions simultaneously
<?php $strings = [ "i like to eat apple", "orange", "Surprise!" ]; foreach ($strings as $string) { echo preg_replace_callback( '~[a-z]+(?=[^a-z]*$)~i', fn($m) => strrev($m[0]), $string ); echo "\n---\n"; }

preferences:
24.45 ms | 405 KiB | 5 Q