3v4l.org

run code in 300+ PHP versions simultaneously
<?php $compare = '\d'; $value = 12345; $pattern = preg_quote($compare); var_dump( (bool) preg_match('~'.$pattern.'~iu', $value) ); var_dump( (bool) preg_match('~\\'.$compare.'~iu', $value) ); var_dump( (bool) preg_match('~\\d~iu', $value) );
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/92cqI
function name:  (null)
number of ops:  35
compiled vars:  !0 = $compare, !1 = $value, !2 = $pattern
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   ASSIGN                                                   !0, '%5Cd'
    4     1        ASSIGN                                                   !1, 12345
    6     2        INIT_FCALL                                               'preg_quote'
          3        SEND_VAR                                                 !0
          4        DO_ICALL                                         $5      
          5        ASSIGN                                                   !2, $5
    8     6        INIT_FCALL                                               'var_dump'
          7        INIT_FCALL                                               'preg_match'
          8        CONCAT                                           ~7      '%7E', !2
          9        CONCAT                                           ~8      ~7, '%7Eiu'
         10        SEND_VAL                                                 ~8
         11        SEND_VAR                                                 !1
         12        DO_ICALL                                         $9      
         13        BOOL                                             ~10     $9
         14        SEND_VAL                                                 ~10
         15        DO_ICALL                                                 
   10    16        INIT_FCALL                                               'var_dump'
         17        INIT_FCALL                                               'preg_match'
         18        CONCAT                                           ~12     '%7E%5C', !0
         19        CONCAT                                           ~13     ~12, '%7Eiu'
         20        SEND_VAL                                                 ~13
         21        SEND_VAR                                                 !1
         22        DO_ICALL                                         $14     
         23        BOOL                                             ~15     $14
         24        SEND_VAL                                                 ~15
         25        DO_ICALL                                                 
   12    26        INIT_FCALL                                               'var_dump'
         27        INIT_FCALL                                               'preg_match'
         28        SEND_VAL                                                 '%7E%5Cd%7Eiu'
         29        SEND_VAR                                                 !1
         30        DO_ICALL                                         $17     
         31        BOOL                                             ~18     $17
         32        SEND_VAL                                                 ~18
         33        DO_ICALL                                                 
         34      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


preferences:
218.56 ms | 1388 KiB | 19 Q