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<?php $string = 'string_snake_string'; $res = preg_replace_callback('/\_(.)/', function($match) { var_dump($match); return ucfirst($match); }, $field); var_dump($res);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/kYIlA
function name:  (null)
number of ops:  12
compiled vars:  !0 = $string, !1 = $res, !2 = $field
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 'string_snake_string'
    4     1        INIT_FCALL                                               'preg_replace_callback'
          2        SEND_VAL                                                 '%2F%5C_%28.%29%2F'
          3        DECLARE_LAMBDA_FUNCTION                                  '%00%7Bclosure%7D%2Fin%2FkYIlA%3A4%240'
    7     4        SEND_VAL                                                 ~4
          5        SEND_VAR                                                 !2
          6        DO_ICALL                                         $5      
    4     7        ASSIGN                                                   !1, $5
    8     8        INIT_FCALL                                               'var_dump'
          9        SEND_VAR                                                 !1
         10        DO_ICALL                                                 
         11      > RETURN                                                   1

Function %00%7Bclosure%7D%2Fin%2FkYIlA%3A4%240:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/kYIlA
function name:  {closure}
number of ops:  9
compiled vars:  !0 = $match
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    4     0  E >   RECV                                             !0      
    5     1        INIT_FCALL                                               'var_dump'
          2        SEND_VAR                                                 !0
          3        DO_ICALL                                                 
    6     4        INIT_FCALL                                               'ucfirst'
          5        SEND_VAR                                                 !0
          6        DO_ICALL                                         $2      
          7      > RETURN                                                   $2
    7     8*     > RETURN                                                   null

End of function %00%7Bclosure%7D%2Fin%2FkYIlA%3A4%240

Generated using Vulcan Logic Dumper, using php 8.0.0


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