3v4l.org

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<?php $a = 'ac'; $b = str_replace('a', 'b', $a); $c = str_replace('c', 'd', $b); print "$a:$b:$c\n"; $a = 'ac'; $b = str_replace(['a', 'c'], ['b', 'd'], $a); print "$a:$b:$c\n";

preferences:
34.12 ms | 402 KiB | 5 Q