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<?php echo preg_replace('/([a-z])([A-Z])/', '$1_$2', 'eOaUi'); die; echo preg_replace_callback('/([a-z])([A-Z])/', function (array $matches) { var_dump($matches); }, 'eOaUi');
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 79) Position 1 = -2
filename:       /in/S2dka
function name:  (null)
number of ops:  15
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'preg_replace'
          1        SEND_VAL                                                 '%2F%28%5Ba-z%5D%29%28%5BA-Z%5D%29%2F'
          2        SEND_VAL                                                 '%241_%242'
          3        SEND_VAL                                                 'eOaUi'
          4        DO_ICALL                                         $0      
          5        ECHO                                                     $0
    5     6      > EXIT                                                     
    7     7*       INIT_FCALL                                               'preg_replace_callback'
          8*       SEND_VAL                                                 '%2F%28%5Ba-z%5D%29%28%5BA-Z%5D%29%2F'
          9*       DECLARE_LAMBDA_FUNCTION                                  '%00%7Bclosure%7D%2Fin%2FS2dka%3A7%240'
   12    10*       SEND_VAL                                                 ~1
         11*       SEND_VAL                                                 'eOaUi'
         12*       DO_ICALL                                         $2      
         13*       ECHO                                                     $2
         14*     > RETURN                                                   1

Function %00%7Bclosure%7D%2Fin%2FS2dka%3A7%240:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/S2dka
function name:  {closure}
number of ops:  5
compiled vars:  !0 = $matches
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    7     0  E >   RECV                                             !0      
   11     1        INIT_FCALL                                               'var_dump'
          2        SEND_VAR                                                 !0
          3        DO_ICALL                                                 
   12     4      > RETURN                                                   null

End of function %00%7Bclosure%7D%2Fin%2FS2dka%3A7%240

Generated using Vulcan Logic Dumper, using php 8.0.0


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