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@ 2020-05-07T01:06:26Z

<?php

$filename = '10.jpg';
$size = 'profile';
echo preg_replace('/(\.[^.]*)$/', "-$size$1", $filename);
echo "\n";
$filename = 'john.smith.jpg';
$size = 'profile';
echo preg_replace('/(\.[^.]*)$/', "-$size$1", $filename);

Output
Performance
VLD
References
Branches

preg_replace: documentation ( source)

preferences:dark modelive previewkey bindings

183.8 ms | 404 KiB | 5 Q