3v4l.org

run code in 300+ PHP versions simultaneously
<?php $var1=1; $var2=0; $var3=2; $var4=-1; for ($i=1;$i<=4;$i++) echo ${"var$i"};
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 42) Position 1 = 11
Branch analysis from position: 11
2 jumps found. (Code = 44) Position 1 = 13, Position 2 = 6
Branch analysis from position: 13
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 6
2 jumps found. (Code = 44) Position 1 = 13, Position 2 = 6
Branch analysis from position: 13
Branch analysis from position: 6
filename:       /in/UFLkr
function name:  (null)
number of ops:  14
compiled vars:  !0 = $var1, !1 = $var2, !2 = $var3, !3 = $var4, !4 = $i
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, 1
    3     1        ASSIGN                                                   !1, 0
    4     2        ASSIGN                                                   !2, 2
    5     3        ASSIGN                                                   !3, -1
    7     4        ASSIGN                                                   !4, 1
          5      > JMP                                                      ->11
          6    >   NOP                                                      
          7        FAST_CONCAT                                      ~10     'var', !4
          8        FETCH_R                      local               ~11     ~10
          9        ECHO                                                     ~11
         10        PRE_INC                                                  !4
         11    >   IS_SMALLER_OR_EQUAL                                      !4, 4
         12      > JMPNZ                                                    ~13, ->6
         13    > > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
150.16 ms | 1393 KiB | 13 Q