3v4l.org

run code in 300+ PHP versions simultaneously
<?php foreach([ null, '', 'x', [0, 0, 'crop'], [0, 0, 123], [0, 0, null], [0, 0, '_foo'], ] as $size) { var_dump(($size[2][0] ?? null) === '_'); }
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 77) Position 1 = 1, Position 2 = 11
Branch analysis from position: 1
2 jumps found. (Code = 78) Position 1 = 2, Position 2 = 11
Branch analysis from position: 2
1 jumps found. (Code = 42) Position 1 = 1
Branch analysis from position: 1
Branch analysis from position: 11
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 11
filename:       /in/77aKk
function name:  (null)
number of ops:  13
compiled vars:  !0 = $size
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    4     0  E > > FE_RESET_R                                       $1      <array>, ->11
          1    > > FE_FETCH_R                                               $1, !0, ->11
   12     2    >   INIT_FCALL                                               'var_dump'
          3        FETCH_DIM_IS                                     ~2      !0, 2
          4        FETCH_DIM_IS                                     ~3      ~2, 0
          5        COALESCE                                         ~4      ~3
          6        QM_ASSIGN                                        ~4      null
          7        IS_IDENTICAL                                     ~5      ~4, '_'
          8        SEND_VAL                                                 ~5
          9        DO_ICALL                                                 
    4    10      > JMP                                                      ->1
         11    >   FE_FREE                                                  $1
   13    12      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
149.47 ms | 1012 KiB | 14 Q