3v4l.org

run code in 300+ PHP versions simultaneously
<?php class foo { function returnArray(){ return [0,1]; } function returnThis(){ return $this; } } $obj = new foo(); var_dump(isset($obj->returnArray()[1])); var_dump(isset($obj->returnThis()->returnArray()[1]));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/M78P4
function name:  (null)
number of ops:  18
compiled vars:  !0 = $obj
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   11     0  E >   NEW                                              $1      'foo'
          1        DO_FCALL                                      0          
          2        ASSIGN                                                   !0, $1
   13     3        INIT_FCALL                                               'var_dump'
          4        INIT_METHOD_CALL                                         !0, 'returnArray'
          5        DO_FCALL                                      0  $4      
          6        ISSET_ISEMPTY_DIM_OBJ                         0  ~5      $4, 1
          7        SEND_VAL                                                 ~5
          8        DO_ICALL                                                 
   14     9        INIT_FCALL                                               'var_dump'
         10        INIT_METHOD_CALL                                         !0, 'returnThis'
         11        DO_FCALL                                      0  $7      
         12        INIT_METHOD_CALL                                         $7, 'returnArray'
         13        DO_FCALL                                      0  $8      
         14        ISSET_ISEMPTY_DIM_OBJ                         0  ~9      $8, 1
         15        SEND_VAL                                                 ~9
         16        DO_ICALL                                                 
         17      > RETURN                                                   1

Class foo:
Function returnarray:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/M78P4
function name:  returnArray
number of ops:  2
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    4     0  E > > RETURN                                                   <array>
    5     1*     > RETURN                                                   null

End of function returnarray

Function returnthis:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/M78P4
function name:  returnThis
number of ops:  3
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    7     0  E >   FETCH_THIS                                       ~0      
          1      > RETURN                                                   ~0
    8     2*     > RETURN                                                   null

End of function returnthis

End of class foo.

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
161.95 ms | 1388 KiB | 15 Q