3v4l.org

run code in 300+ PHP versions simultaneously
<?php function ref(&$ref) { var_dump($ref); } class a { function __construct() { $args = array(&$this); for ($i = 0; $i < 2; $i++) { $a = array_slice($args, 0, 1); call_user_func_array('ref', $a); } } }; new a();
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/MCmnj
function name:  (null)
number of ops:  4
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   17     0  E >   NEW                                              $0      'a'
          1        DO_FCALL                                      0          
          2        FREE                                                     $0
          3      > RETURN                                                   1

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

End of function ref

Class a:
Function __construct:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 42) Position 1 = 16
Branch analysis from position: 16
2 jumps found. (Code = 44) Position 1 = 18, Position 2 = 5
Branch analysis from position: 18
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 5
2 jumps found. (Code = 44) Position 1 = 18, Position 2 = 5
Branch analysis from position: 18
Branch analysis from position: 5
filename:       /in/MCmnj
function name:  __construct
number of ops:  19
compiled vars:  !0 = $args, !1 = $i, !2 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    9     0  E >   FETCH_THIS                                       $3      
          1        INIT_ARRAY                                       ~4      $3
          2        ASSIGN                                                   !0, ~4
   10     3        ASSIGN                                                   !1, 0
          4      > JMP                                                      ->16
   11     5    >   INIT_FCALL                                               'array_slice'
          6        SEND_VAR                                                 !0
          7        SEND_VAL                                                 0
          8        SEND_VAL                                                 1
          9        DO_ICALL                                         $7      
         10        ASSIGN                                                   !2, $7
   12    11        INIT_FCALL                                               'ref'
         12        SEND_ARRAY                                               !2
         13        CHECK_UNDEF_ARGS                                         
         14        DO_FCALL                                      0          
   10    15        PRE_INC                                                  !1
         16    >   IS_SMALLER                                               !1, 2
         17      > JMPNZ                                                    ~11, ->5
   14    18    > > RETURN                                                   null

End of function __construct

End of class a.

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
199.24 ms | 1403 KiB | 18 Q