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@ 2018-08-29T10:15:08Z

<?php

$myString = "14f05000034e69";
    
$test = preg_replace('/(.)(.)/', '$2$1', $myString);

echo $test;

Output
Performance
VLD
References
Branches

preg_replace: documentation ( source)

preferences:dark modelive previewkey bindings

27.49 ms | 405 KiB | 5 Q