3v4l.org

run code in 300+ PHP versions simultaneously
<?php $string = "ZEESHAN"; $i =0; while(($string[$i])!=null){ $i++; } $i--; while(($string[$i])!=null){ echo $string[$i]; $i--; }
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 42) Position 1 = 4
Branch analysis from position: 4
2 jumps found. (Code = 44) Position 1 = 7, Position 2 = 3
Branch analysis from position: 7
1 jumps found. (Code = 42) Position 1 = 12
Branch analysis from position: 12
2 jumps found. (Code = 44) Position 1 = 15, Position 2 = 9
Branch analysis from position: 15
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 9
2 jumps found. (Code = 44) Position 1 = 15, Position 2 = 9
Branch analysis from position: 15
Branch analysis from position: 9
Branch analysis from position: 3
2 jumps found. (Code = 44) Position 1 = 7, Position 2 = 3
Branch analysis from position: 7
Branch analysis from position: 3
filename:       /in/vfUFK
function name:  (null)
number of ops:  16
compiled vars:  !0 = $string, !1 = $i
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 'ZEESHAN'
    5     1        ASSIGN                                                   !1, 0
    7     2      > JMP                                                      ->4
    9     3    >   PRE_INC                                                  !1
    7     4    >   FETCH_DIM_R                                      ~5      !0, !1
          5        IS_NOT_EQUAL                                             ~5, null
          6      > JMPNZ                                                    ~6, ->3
   13     7    >   PRE_DEC                                                  !1
   15     8      > JMP                                                      ->12
   17     9    >   FETCH_DIM_R                                      ~8      !0, !1
         10        ECHO                                                     ~8
   19    11        PRE_DEC                                                  !1
   15    12    >   FETCH_DIM_R                                      ~10     !0, !1
         13        IS_NOT_EQUAL                                             ~10, null
         14      > JMPNZ                                                    ~11, ->9
   21    15    > > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
164.42 ms | 1394 KiB | 13 Q