3v4l.org

run code in 300+ PHP versions simultaneously
<?php $str = "racecar"; $pal = ""; for($a=0; $a<(strlen($str)-1); $a++) { for($z=0; $z<strlen($str); $z++) { $subs = substr($str, $a, $z); if( $subs == strrev($subs) and strlen($subs) > strlen($pal) ) { $pal = $subs; } } } echo $pal;
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 42) Position 1 = 28
Branch analysis from position: 28
2 jumps found. (Code = 44) Position 1 = 32, Position 2 = 4
Branch analysis from position: 32
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 4
1 jumps found. (Code = 42) Position 1 = 24
Branch analysis from position: 24
2 jumps found. (Code = 44) Position 1 = 27, Position 2 = 6
Branch analysis from position: 27
2 jumps found. (Code = 44) Position 1 = 32, Position 2 = 4
Branch analysis from position: 32
Branch analysis from position: 4
Branch analysis from position: 6
2 jumps found. (Code = 46) Position 1 = 17, Position 2 = 21
Branch analysis from position: 17
2 jumps found. (Code = 43) Position 1 = 22, Position 2 = 23
Branch analysis from position: 22
2 jumps found. (Code = 44) Position 1 = 27, Position 2 = 6
Branch analysis from position: 27
Branch analysis from position: 6
Branch analysis from position: 23
Branch analysis from position: 21
filename:       /in/W5GkR
function name:  (null)
number of ops:  34
compiled vars:  !0 = $str, !1 = $pal, !2 = $a, !3 = $z, !4 = $subs
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, 'racecar'
    4     1        ASSIGN                                                   !1, ''
    6     2        ASSIGN                                                   !2, 0
          3      > JMP                                                      ->28
    8     4    >   ASSIGN                                                   !3, 0
          5      > JMP                                                      ->24
    9     6    >   INIT_FCALL                                               'substr'
          7        SEND_VAR                                                 !0
          8        SEND_VAR                                                 !2
          9        SEND_VAR                                                 !3
         10        DO_ICALL                                         $9      
         11        ASSIGN                                                   !4, $9
   10    12        INIT_FCALL                                               'strrev'
         13        SEND_VAR                                                 !4
         14        DO_ICALL                                         $11     
         15        IS_EQUAL                                         ~12     !4, $11
         16      > JMPZ_EX                                          ~12     ~12, ->21
         17    >   STRLEN                                           ~13     !4
         18        STRLEN                                           ~14     !1
         19        IS_SMALLER                                       ~15     ~14, ~13
         20        BOOL                                             ~12     ~15
         21    > > JMPZ                                                     ~12, ->23
   12    22    >   ASSIGN                                                   !1, !4
    8    23    >   PRE_INC                                                  !3
         24    >   STRLEN                                           ~18     !0
         25        IS_SMALLER                                               !3, ~18
         26      > JMPNZ                                                    ~19, ->6
    6    27    >   PRE_INC                                                  !2
         28    >   STRLEN                                           ~21     !0
         29        SUB                                              ~22     ~21, 1
         30        IS_SMALLER                                               !2, ~22
         31      > JMPNZ                                                    ~23, ->4
   18    32    >   ECHO                                                     !1
         33      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
154.39 ms | 1392 KiB | 17 Q