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<?php preg_match('/(?P<year>[0-9]){4}/', '2005', $m); var_dump($m);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/mpQg9
function name:  (null)
number of ops:  9
compiled vars:  !0 = $m
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    5     0  E >   INIT_FCALL                                               'preg_match'
          1        SEND_VAL                                                 '%2F%28%3FP%3Cyear%3E%5B0-9%5D%29%7B4%7D%2F'
          2        SEND_VAL                                                 '2005'
          3        SEND_REF                                                 !0
          4        DO_ICALL                                                 
    9     5        INIT_FCALL                                               'var_dump'
          6        SEND_VAR                                                 !0
          7        DO_ICALL                                                 
          8      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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