3v4l.org

run code in 300+ PHP versions simultaneously
<?php $n = trim(' 34'); echo preg_match('/^\d+$/', $n); echo $n<0;
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/IEkOp
function name:  (null)
number of ops:  12
compiled vars:  !0 = $n
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   INIT_FCALL                                               'trim'
          1        SEND_VAL                                                 '++34'
          2        DO_ICALL                                         $1      
          3        ASSIGN                                                   !0, $1
    3     4        INIT_FCALL                                               'preg_match'
          5        SEND_VAL                                                 '%2F%5E%5Cd%2B%24%2F'
          6        SEND_VAR                                                 !0
          7        DO_ICALL                                         $3      
          8        ECHO                                                     $3
    4     9        IS_SMALLER                                       ~4      !0, 0
         10        ECHO                                                     ~4
         11      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
161.23 ms | 1394 KiB | 17 Q