<?php $str = 'I loved you'; $from = 'love'; $to = 'lOvE'; var_dump($result1 = strtr($str, $from, $to)); var_dump($result2 = strtr($str, [$from[0] => $to[0], $from[1] => $to[1], $from[2] => $to[2], $from[3] => $to[3]])); var_dump($result2 = strtr($str, [$from => $to])); var_dump($result1===$result2);//false
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