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<?php var_dump( preg_match('/(.*)\?.*/', 'jpg?u=w3544w5a_dsfsd&sdsg=24353453', $matches), $matches );
Output for 4.3.0 - 7.1.0
int(1) array(2) { [0]=> string(34) "jpg?u=w3544w5a_dsfsd&sdsg=24353453" [1]=> string(3) "jpg" }