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<?php $text = "PHp: A programming language"; $result = preg_replace_callback('/^([^a-z]*)([a-z])/i', function($m) { return $m[1].strtoupper($m[2]); }, $text); echo $result;
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/dqpPl
function name:  (null)
number of ops:  10
compiled vars:  !0 = $text, !1 = $result
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 'PHp%3A+A+programming+language'
    4     1        INIT_FCALL                                               'preg_replace_callback'
          2        SEND_VAL                                                 '%2F%5E%28%5B%5Ea-z%5D%2A%29%28%5Ba-z%5D%29%2Fi'
          3        DECLARE_LAMBDA_FUNCTION                                  '%00%7Bclosure%7D%2Fin%2FdqpPl%3A4%240'
    7     4        SEND_VAL                                                 ~3
          5        SEND_VAR                                                 !0
          6        DO_ICALL                                         $4      
    4     7        ASSIGN                                                   !1, $4
    9     8        ECHO                                                     !1
          9      > RETURN                                                   1

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

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

Generated using Vulcan Logic Dumper, using php 8.0.0


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