<?php $photos = [ 'photo-Bname_0333.jpg', 'photo-Bname_0222.jpg', 'photo-Aname_0333.jpg', 'photo-Cname_0111.jpg', 'photo-Cname_0222.jpg', 'photo-Aname_0112.jpg', ]; usort($photos, function ($a, $b) { return array_reverse(explode('_', $a, 2)) <=> array_reverse(explode('_', $b, 2)); }); var_export($photos);
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