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<?php $array = array('a' => 'Hello', 'b' => 'World'); array_walk($array, 'adda'); function adda(&$value, &$key) { $key = "a".$key; } var_dump($array);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/b8gAJ
function name:  (null)
number of ops:  9
compiled vars:  !0 = $array
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   QM_ASSIGN                                                !0
   4     1        INIT_FCALL                                               'array_walk'
         2        SEND_REF                                                 !0
         3        SEND_VAL                                                 'adda'
         4        DO_ICALL                                                 
   9     5        INIT_FCALL                                               'var_dump'
         6        SEND_VAR                                                 !0
         7        DO_ICALL                                                 
         8      > RETURN                                                   1

Function adda:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/b8gAJ
function name:  adda
number of ops:  5
compiled vars:  !0 = $value, !1 = $key
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   6     0  E >   RECV                                             !0      
         1        RECV                                             !1      
   7     2        CONCAT                                           ~2      'a', !1
         3        QM_ASSIGN                                                !1
   8     4      > RETURN                                                   null

End of function adda

Generated using Vulcan Logic Dumper, using php 7.4.0