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@ 2019-07-24T20:53:50Z

<?php

$str = "luke";
echo preg_replace_callback('~^(?![eiux])[a-z]~', function($m) {
    return ucfirst($m[0]);
}, $str);

$str = "egg";
echo "\n" . preg_replace_callback('~^(?![eiux])[a-z]~', function($m) {
    return ucfirst($m[0]);
}, $str);

Output
Performance
VLD
References
Branches

preg_replace_callback: documentation ( source)
ucfirst: documentation ( source)

preferences:dark modelive preview

56.61 ms | 405 KiB | 5 Q