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<?php function test($var) { debug_zval_dump($var); //$GLOBALS['a']++; echo $var; } $a = 0; test($a);
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/3Aub2
function name:  (null)
number of ops:  6
compiled vars:  !0 = $a
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   NOP                                                      
  10     1        ASSIGN                                                   !0, 0
  11     2        INIT_FCALL                                               'test'
         3        SEND_VAR                                                 !0
         4        DO_FCALL                                      0          
         5      > RETURN                                                   1

Function test:
Finding entry points
Branch analysis from position: 0
Jump found. Position 1 = -2
filename:       /in/3Aub2
function name:  test
number of ops:  6
compiled vars:  !0 = $var
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   RECV                                             !0      
   5     1        INIT_FCALL                                               'debug_zval_dump'
         2        SEND_VAR                                                 !0
         3        DO_ICALL                                                 
   7     4        ECHO                                                     !0
   8     5      > RETURN                                                   null

End of function test

Generated using Vulcan Logic Dumper, using php 7.2.0