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<?php function foo($arg){ var_dump($arg); } preg_replace('/a/', foo("$1"), 'a');
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/TTfrb
function name:  (null)
number of ops:  9
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    5     0  E >   INIT_FCALL                                               'preg_replace'
          1        SEND_VAL                                                 '%2Fa%2F'
          2        INIT_FCALL                                               'foo'
          3        SEND_VAL                                                 '%241'
          4        DO_FCALL                                      0  $0      
          5        SEND_VAR                                                 $0
          6        SEND_VAL                                                 'a'
          7        DO_ICALL                                                 
          8      > RETURN                                                   1

Function foo:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/TTfrb
function name:  foo
number of ops:  5
compiled vars:  !0 = $arg
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   RECV                                             !0      
    3     1        INIT_FCALL                                               'var_dump'
          2        SEND_VAR                                                 !0
          3        DO_ICALL                                                 
    4     4      > RETURN                                                   null

End of function foo

Generated using Vulcan Logic Dumper, using php 8.0.0


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