3v4l.org

run code in 300+ PHP versions simultaneously
<?php $str = "aaaaa"; $replacements = array( "aa" => "b", "ba" => "c", "b" => "d", ); print(str_replace(array_keys($replacements), array_values($replacements), $str));

preferences:
40.18 ms | 402 KiB | 5 Q