3v4l.org

run code in 500+ PHP versions simultaneously
<?php class C { public ?int $v = 123; } $x = new C; unset($x->v); $y = new C; $y->v = null; print @array_key_exists('v', $x); print @array_key_exists('v', $y);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/rH4p4
function name:  (null)
number of ops:  18
compiled vars:  !0 = $x, !1 = $y
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    4     0  E >   NEW                                                  $2      'C'
          1        DO_FCALL                                          0          
          2        ASSIGN                                                       !0, $2
          3        UNSET_OBJ                                                    !0, 'v'
    5     4        NEW                                                  $5      'C'
          5        DO_FCALL                                          0          
          6        ASSIGN                                                       !1, $5
          7        ASSIGN_OBJ                                                   !1, 'v'
          8        OP_DATA                                                      null
    7     9        BEGIN_SILENCE                                        ~9      
         10        ARRAY_KEY_EXISTS                                     ~10     'v', !0
         11        END_SILENCE                                                  ~9
         12        ECHO                                                         ~10
    8    13        BEGIN_SILENCE                                        ~11     
         14        ARRAY_KEY_EXISTS                                     ~12     'v', !1
         15        END_SILENCE                                                  ~11
         16        ECHO                                                         ~12
         17      > RETURN                                                       1

Class C: [no user functions]

Generated using Vulcan Logic Dumper, using php 8.5.0


preferences:
126.19 ms | 475 KiB | 7 Q