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@ 2015-10-22T17:44:30Z

<?php

    $someString = "abcABC!!!ABCabc";
    
    echo strtolower(preg_replace("/[^a-zA-Z]/", "", $someString));
    
    echo "\n\n\n";
    
    $tmp = strtolower($someString);
    echo preg_replace("/[^a-zA-Z]/", "", $tmp);

Output
Performance
VLD
References
Branches

strtolower: documentation ( source)

preferences:dark modelive previewkey bindings

51.47 ms | 1740 KiB | 5 Q