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<?php var_dump(preg_match("/(?P<foo>\\d{2,4})/si", 'foo bar 439689 lol', $m), $m);
based on KRfZH
Output for 4.3.3 - 7.2.0
int(1) array(3) { [0]=> string(4) "4396" ["foo"]=> string(4) "4396" [1]=> string(4) "4396" }
Output for 4.3.0 - 4.3.2
int(1) array(2) { [0]=> string(4) "4396" [1]=> string(4) "4396" }