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<?php $word = "word,!pineapple--pizza 123"; $revd = preg_replace_callback('#([A-Za-z]+)#', 'rev_first', $word); function rev_first($matches){ return strrev($matches[1]); } var_dump($revd);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/W1BBI
function name:  (null)
number of ops:  11
compiled vars:  !0 = $word, !1 = $revd
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 'word%2C%21pineapple--pizza+123'
    4     1        INIT_FCALL                                               'preg_replace_callback'
          2        SEND_VAL                                                 '%23%28%5BA-Za-z%5D%2B%29%23'
          3        SEND_VAL                                                 'rev_first'
          4        SEND_VAR                                                 !0
          5        DO_ICALL                                         $3      
          6        ASSIGN                                                   !1, $3
   10     7        INIT_FCALL                                               'var_dump'
          8        SEND_VAR                                                 !1
          9        DO_ICALL                                                 
         10      > RETURN                                                   1

Function rev_first:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/W1BBI
function name:  rev_first
number of ops:  7
compiled vars:  !0 = $matches
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    6     0  E >   RECV                                             !0      
    7     1        INIT_FCALL                                               'strrev'
          2        FETCH_DIM_R                                      ~1      !0, 1
          3        SEND_VAL                                                 ~1
          4        DO_ICALL                                         $2      
          5      > RETURN                                                   $2
    8     6*     > RETURN                                                   null

End of function rev_first

Generated using Vulcan Logic Dumper, using php 8.0.0


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