3v4l.org

run code in 300+ PHP versions simultaneously
<?php $x = null; $x++; var_dump($x); $x--; var_dump($x); $x = null; $x--; var_dump($x);
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/bmu4L
function name:  (null)
number of ops:  15
compiled vars:  !0 = $x
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, null
    4     1        PRE_INC                                                  !0
    5     2        INIT_FCALL                                               'var_dump'
          3        SEND_VAR                                                 !0
          4        DO_ICALL                                                 
    6     5        PRE_DEC                                                  !0
    7     6        INIT_FCALL                                               'var_dump'
          7        SEND_VAR                                                 !0
          8        DO_ICALL                                                 
    9     9        ASSIGN                                                   !0, null
   10    10        PRE_DEC                                                  !0
   11    11        INIT_FCALL                                               'var_dump'
         12        SEND_VAR                                                 !0
         13        DO_ICALL                                                 
         14      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
174.44 ms | 1394 KiB | 15 Q