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<?php $string = 'bar'; $matches = []; preg_match('~(?|foo(*:1) |bar(*:2) |baz(*:3))~x', $string, $matches); var_dump($matches);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/ErCrp
function name:  (null)
number of ops:  11
compiled vars:  !0 = $string, !1 = $matches
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                       !0, 'bar'
    4     1        ASSIGN                                                       !1, <array>
    6     2        INIT_FCALL                                                   'preg_match'
          3        SEND_VAL                                                     '%7E%28%3F%7Cfoo%28%2A%3A1%29%0A+++++++++++++++%7Cbar%28%2A%3A2%29%0A+++++++++++++++%7Cbaz%28%2A%3A3%29%29%7Ex'
    8     4        SEND_VAR                                                     !0
          5        SEND_REF                                                     !1
    6     6        DO_ICALL                                                     
   10     7        INIT_FCALL                                                   'var_dump'
          8        SEND_VAR                                                     !1
          9        DO_ICALL                                                     
         10      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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