3v4l.org

run code in 300+ PHP versions simultaneously
<?php $s = '12345'; $s[$s[1]] = '2'; echo $s;
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/7dhlu
function name:  (null)
number of ops:  6
compiled vars:  !0 = $s
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, '12345'
    3     1        FETCH_DIM_R                                      ~2      !0, 1
          2        ASSIGN_DIM                                               !0, ~2
          3        OP_DATA                                                  '2'
    4     4        ECHO                                                     !0
          5      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
154.17 ms | 1392 KiB | 13 Q