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<?php $matches = null; $x = preg_match('/(d{1,2}([a-z]+)) /', '21st March 2006', $matches); var_dump($x); var_dump($matches);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/DHuE0
function name:  (null)
number of ops:  14
compiled vars:  !0 = $matches, !1 = $x
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, null
    3     1        INIT_FCALL                                               'preg_match'
          2        SEND_VAL                                                 '%2F%28d%7B1%2C2%7D%28%5Ba-z%5D%2B%29%29+%2F'
          3        SEND_VAL                                                 '21st+March+2006'
          4        SEND_REF                                                 !0
          5        DO_ICALL                                         $3      
          6        ASSIGN                                                   !1, $3
    5     7        INIT_FCALL                                               'var_dump'
          8        SEND_VAR                                                 !1
          9        DO_ICALL                                                 
    6    10        INIT_FCALL                                               'var_dump'
         11        SEND_VAR                                                 !0
         12        DO_ICALL                                                 
         13      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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