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<?php $values = array(-5,2,3,-8,4,-1,0); array_walk($values, "abs"); function myAbs(&$val){ $val = abs($val); } array_walk($values, "myAbs");
based on qto2V
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/5rujV
function name:  (null)
number of ops:  11
compiled vars:  !0 = $values
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   ASSIGN                                                   !0, <array>
   4     1        INIT_FCALL                                               'array_walk'
         2        SEND_REF                                                 !0
         3        SEND_VAL                                                 'abs'
         4        DO_ICALL                                                 
   6     5        NOP                                                      
   9     6        INIT_FCALL                                               'array_walk'
         7        SEND_REF                                                 !0
         8        SEND_VAL                                                 'myAbs'
         9        DO_ICALL                                                 
        10      > RETURN                                                   1

Function myabs:
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/5rujV
function name:  myAbs
number of ops:  6
compiled vars:  !0 = $val
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   6     0  E >   RECV                                             !0      
   7     1        INIT_FCALL                                               'abs'
         2        SEND_VAR                                                 !0
         3        DO_ICALL                                         $1      
         4        ASSIGN                                                   !0, $1
   8     5      > RETURN                                                   null

End of function myabs

Generated using Vulcan Logic Dumper, using php 7.3.0