3v4l.org

run code in 300+ PHP versions simultaneously
<?php $var = ''; $name = ' svc251'; $r = preg_match('|^svc(\d+)$|', $name, $var); var_dump($r); print("\n\n"); var_dump($var); print("\n\n");
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/9NIW8
function name:  (null)
number of ops:  17
compiled vars:  !0 = $var, !1 = $name, !2 = $r
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   ASSIGN                                                   !0, ''
    4     1        ASSIGN                                                   !1, '+svc251'
    5     2        INIT_FCALL                                               'preg_match'
          3        SEND_VAL                                                 '%7C%5Esvc%28%5Cd%2B%29%24%7C'
          4        SEND_VAR                                                 !1
          5        SEND_REF                                                 !0
          6        DO_ICALL                                         $5      
          7        ASSIGN                                                   !2, $5
    7     8        INIT_FCALL                                               'var_dump'
          9        SEND_VAR                                                 !2
         10        DO_ICALL                                                 
         11        ECHO                                                     '%0A%0A'
    8    12        INIT_FCALL                                               'var_dump'
         13        SEND_VAR                                                 !0
         14        DO_ICALL                                                 
         15        ECHO                                                     '%0A%0A'
         16      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
145.75 ms | 1394 KiB | 17 Q