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<?php function foo(&$http_response_header) { file_get_contents('http://www.google.com'); } $x = null; foo($x); var_dump($x);
based on k7e5N
Finding entry points
Branch analysis from position: 0
Jump found. (Code = 62) Position 1 = -2
filename:       /in/QqSZX
function name:  (null)
number of ops:  9
compiled vars:  !0 = $x
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   NOP                                                      
   7     1        ASSIGN                                                   !0, null
   8     2        INIT_FCALL                                               'foo'
         3        SEND_REF                                                 !0
         4        DO_FCALL                                      0          
  10     5        INIT_FCALL                                               'var_dump'
         6        SEND_VAR                                                 !0
         7        DO_ICALL                                                 
         8      > RETURN                                                   1

Function foo:
Finding entry points
Branch analysis from position: 0
Jump found. (Code = 62) Position 1 = -2
filename:       /in/QqSZX
function name:  foo
number of ops:  5
compiled vars:  !0 = $http_response_header
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   3     0  E >   RECV                                             !0      
   4     1        INIT_FCALL                                               'file_get_contents'
         2        SEND_VAL                                                 'http%3A%2F%2Fwww.google.com'
         3        DO_ICALL                                                 
   5     4      > RETURN                                                   null

End of function foo

Generated using Vulcan Logic Dumper, using php 7.1.0