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@ 2021-07-01T15:59:53Z

<?php

function replaceFileName($input, $newFileName) {
    $info = pathInfo($input);
    return $info['dirname'] . DIRECTORY_SEPARATOR . $newFileName . '.' . $info['extension'];
}

$test = "/txt/txt/txt/txt.txt";
var_dump(replaceFileName($test, 'testing'));

Output
Performance
VLD
References
Branches

pathinfo: documentation ( source)
var_dump: documentation ( source)

preferences:dark modelive preview

28.47 ms | 402 KiB | 5 Q