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<?php function foo(&$a) { $a = 10; var_dump(debug_backtrace()); } $x = 5; foo($x);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/fOrXL
function name:  (null)
number of ops:  5
compiled vars:  !0 = $x
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    8     0  E >   ASSIGN                                                   !0, 5
    9     1        INIT_FCALL                                               'foo'
          2        SEND_REF                                                 !0
          3        DO_FCALL                                      0          
          4      > RETURN                                                   1

Function foo:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/fOrXL
function name:  foo
number of ops:  8
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   RECV                                             !0      
    4     1        ASSIGN                                                   !0, 10
    5     2        INIT_FCALL                                               'var_dump'
          3        INIT_FCALL                                               'debug_backtrace'
          4        DO_ICALL                                         $2      
          5        SEND_VAR                                                 $2
          6        DO_ICALL                                                 
    6     7      > RETURN                                                   null

End of function foo

Generated using Vulcan Logic Dumper, using php 8.0.0


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