3v4l.org

run code in 500+ PHP versions simultaneously
<?php echo "\$a unset\n isset: "; var_export(isset($a)); echo "\n value: "; var_export($a); echo "\n\n"; $a = null; echo "\$a is null\n isset: "; var_export(isset($a)); echo "\n value: "; var_export($a); echo "\n\n"; $a = (object) null; echo "\$a is object\n isset: "; var_export(isset($a)); echo "\n value: "; var_export($a); echo "\n\n"; echo "\$a->b unset:\n isset: "; var_export(isset($a->b)); echo "\n value: "; var_export($a->b); echo "\n\n"; $a->b = null; echo "\$a->b is null:\n isset: "; var_export(isset($a->b)); echo "\n value: "; var_export($a->b); echo "\n\n"; echo "\$a->b is null, what's \$a?\n isset: "; var_export(isset($a)); echo "\n value: "; var_export($a); echo "\n";
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/ngRNN
function name:  (null)
number of ops:  68
compiled vars:  !0 = $a
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    2     0  E >   ECHO                                                         '%24a+unset%0A+isset%3A+'
    3     1        INIT_FCALL                                                   'var_export'
          2        ISSET_ISEMPTY_CV                                     ~1      !0
          3        SEND_VAL                                                     ~1
          4        DO_ICALL                                                     
    4     5        ECHO                                                         '%0A+value%3A+'
    5     6        INIT_FCALL                                                   'var_export'
          7        SEND_VAR                                                     !0
          8        DO_ICALL                                                     
    6     9        ECHO                                                         '%0A%0A'
    7    10        ASSIGN                                                       !0, null
    8    11        ECHO                                                         '%24a+is+null%0A+isset%3A+'
    9    12        INIT_FCALL                                                   'var_export'
         13        ISSET_ISEMPTY_CV                                     ~5      !0
         14        SEND_VAL                                                     ~5
         15        DO_ICALL                                                     
   10    16        ECHO                                                         '%0A+value%3A+'
   11    17        INIT_FCALL                                                   'var_export'
         18        SEND_VAR                                                     !0
         19        DO_ICALL                                                     
   12    20        ECHO                                                         '%0A%0A'
   14    21        CAST                                              8  ~8      null
         22        ASSIGN                                                       !0, ~8
   15    23        ECHO                                                         '%24a+is+object%0A+isset%3A+'
   16    24        INIT_FCALL                                                   'var_export'
         25        ISSET_ISEMPTY_CV                                     ~10     !0
         26        SEND_VAL                                                     ~10
         27        DO_ICALL                                                     
   17    28        ECHO                                                         '%0A+value%3A+'
   18    29        INIT_FCALL                                                   'var_export'
         30        SEND_VAR                                                     !0
         31        DO_ICALL                                                     
   19    32        ECHO                                                         '%0A%0A'
   20    33        ECHO                                                         '%24a-%3Eb+unset%3A%0A+isset%3A+'
   21    34        INIT_FCALL                                                   'var_export'
         35        ISSET_ISEMPTY_PROP_OBJ                               ~13     !0, 'b'
         36        SEND_VAL                                                     ~13
         37        DO_ICALL                                                     
   22    38        ECHO                                                         '%0A+value%3A+'
   23    39        INIT_FCALL                                                   'var_export'
         40        FETCH_OBJ_R                                          ~15     !0, 'b'
         41        SEND_VAL                                                     ~15
         42        DO_ICALL                                                     
   24    43        ECHO                                                         '%0A%0A'
   25    44        ASSIGN_OBJ                                                   !0, 'b'
         45        OP_DATA                                                      null
   26    46        ECHO                                                         '%24a-%3Eb+is+null%3A%0A+isset%3A+'
   27    47        INIT_FCALL                                                   'var_export'
         48        ISSET_ISEMPTY_PROP_OBJ                               ~18     !0, 'b'
         49        SEND_VAL                                                     ~18
         50        DO_ICALL                                                     
   28    51        ECHO                                                         '%0A+value%3A+'
   29    52        INIT_FCALL                                                   'var_export'
         53        FETCH_OBJ_R                                          ~20     !0, 'b'
         54        SEND_VAL                                                     ~20
         55        DO_ICALL                                                     
   30    56        ECHO                                                         '%0A%0A'
   31    57        ECHO                                                         '%24a-%3Eb+is+null%2C+what%27s+%24a%3F%0A+isset%3A+'
   32    58        INIT_FCALL                                                   'var_export'
         59        ISSET_ISEMPTY_CV                                     ~22     !0
         60        SEND_VAL                                                     ~22
         61        DO_ICALL                                                     
   33    62        ECHO                                                         '%0A+value%3A+'
   34    63        INIT_FCALL                                                   'var_export'
         64        SEND_VAR                                                     !0
         65        DO_ICALL                                                     
   35    66        ECHO                                                         '%0A'
         67      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


preferences:
157.06 ms | 2156 KiB | 14 Q