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<?php $s = "test"; preg_match("/(?P<differentword>(test))/", $s, $matches); var_dump(array_keys($matches));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/U9XUs
function name:  (null)
number of ops:  13
compiled vars:  !0 = $s, !1 = $matches
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, 'test'
    3     1        INIT_FCALL                                               'preg_match'
          2        SEND_VAL                                                 '%2F%28%3FP%3Cdifferentword%3E%28test%29%29%2F'
          3        SEND_VAR                                                 !0
          4        SEND_REF                                                 !1
          5        DO_ICALL                                                 
    4     6        INIT_FCALL                                               'var_dump'
          7        INIT_FCALL                                               'array_keys'
          8        SEND_VAR                                                 !1
          9        DO_ICALL                                         $4      
         10        SEND_VAR                                                 $4
         11        DO_ICALL                                                 
         12      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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