3v4l.org

run code in 300+ PHP versions simultaneously
<?php // Positive numbers: $a=substr("tag1,tag10,tag11,tag13,tag15,tag17,tag19,tag20,tag4,tag9,tag8,tag7,tag6,tag5,tag3,tag2,tag18,tag16,tag14,tag12",0,4); echo $a; echo preg_replace("/tag/","",substr("tag1,tag10,tag11,tag13,tag15,tag17,tag19,tag20,tag4,tag9,tag8,tag7,tag6,tag5,tag3,tag2,tag18",5)); ?>
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/S5i8L
function name:  (null)
number of ops:  18
compiled vars:  !0 = $a
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'substr'
          1        SEND_VAL                                                 'tag1%2Ctag10%2Ctag11%2Ctag13%2Ctag15%2Ctag17%2Ctag19%2Ctag20%2Ctag4%2Ctag9%2Ctag8%2Ctag7%2Ctag6%2Ctag5%2Ctag3%2Ctag2%2Ctag18%2Ctag16%2Ctag14%2Ctag12'
          2        SEND_VAL                                                 0
          3        SEND_VAL                                                 4
          4        DO_ICALL                                         $1      
          5        ASSIGN                                                   !0, $1
    4     6        ECHO                                                     !0
    6     7        INIT_FCALL                                               'preg_replace'
          8        SEND_VAL                                                 '%2Ftag%2F'
          9        SEND_VAL                                                 ''
         10        INIT_FCALL                                               'substr'
         11        SEND_VAL                                                 'tag1%2Ctag10%2Ctag11%2Ctag13%2Ctag15%2Ctag17%2Ctag19%2Ctag20%2Ctag4%2Ctag9%2Ctag8%2Ctag7%2Ctag6%2Ctag5%2Ctag3%2Ctag2%2Ctag18'
         12        SEND_VAL                                                 5
         13        DO_ICALL                                         $3      
         14        SEND_VAR                                                 $3
         15        DO_ICALL                                         $4      
         16        ECHO                                                     $4
    8    17      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
149.32 ms | 1386 KiB | 17 Q