3v4l.org

run code in 500+ PHP versions simultaneously
<?php $str = "1111 2222 3333 4444 5555 6666"; if (preg_match('~\A(?:\d{4}\s?)+\z~', $str)) { print_r(preg_split('~\s~', $str)); }
Finding entry points
Branch analysis from position: 0
2 jumps found. (Code = 43) Position 1 = 3, Position 2 = 10
Branch analysis from position: 3
1 jumps found. (Code = 62) Position 1 = -2
Branch analysis from position: 10
filename:       /in/7HhgU
function name:  (null)
number of ops:  11
compiled vars:  !0 = $str
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                       !0, '1111+2222+3333+4444+5555+6666'
    4     1        FRAMELESS_ICALL_2                preg_match          ~2      '%7E%5CA%28%3F%3A%5Cd%7B4%7D%5Cs%3F%29%2B%5Cz%7E', !0
          2      > JMPZ                                                         ~2, ->10
    5     3    >   INIT_FCALL                                                   'print_r'
          4        INIT_FCALL                                                   'preg_split'
          5        SEND_VAL                                                     '%7E%5Cs%7E'
          6        SEND_VAR                                                     !0
          7        DO_ICALL                                             $3      
          8        SEND_VAR                                                     $3
          9        DO_ICALL                                                     
    6    10    > > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


preferences:
167.27 ms | 2086 KiB | 15 Q