3v4l.org

run code in 300+ PHP versions simultaneously
<?php $a = [[00, 01, 02, 03], [10, 11, 12, 13], [20, 21, 22, 14], [30, 31, 32, 34]]; $b = 2; echo $a[$b][$b++], PHP_EOL; $b = 2; echo $a[$b=$b][$b++], PHP_EOL;
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/lfMPl
function name:  (null)
number of ops:  15
compiled vars:  !0 = $a, !1 = $b
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, <array>
    8     1        ASSIGN                                                   !1, 2
    9     2        POST_INC                                         ~5      !1
          3        FETCH_DIM_R                                      ~4      !0, !1
          4        FETCH_DIM_R                                      ~6      ~4, ~5
          5        ECHO                                                     ~6
          6        ECHO                                                     '%0A'
   11     7        ASSIGN                                                   !1, 2
   12     8        ASSIGN                                           ~8      !1, !1
          9        POST_INC                                         ~10     !1
         10        FETCH_DIM_R                                      ~9      !0, ~8
         11        FETCH_DIM_R                                      ~11     ~9, ~10
         12        ECHO                                                     ~11
         13        ECHO                                                     '%0A'
         14      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
153.78 ms | 1393 KiB | 13 Q