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<?php var_dump(preg_match('~[-abc]~', '-')); // possible au début var_dump(preg_match('~[abc-]~', '-')); // possible à la fin var_dump(preg_match('~[^-abc]~', 'A')); // possible juste aprés le caractère de négation de classe ^ var_dump(preg_match('~[a-z-0]~', '-')); // possible aprés un range var_dump(preg_match('~[a-z-\s]~', '-')); // idem var_dump(preg_match('~[a-z-0-9]~', '-')); // idem // possible jusqu'à PHP 7.2 inclus // mais interdit à partir de PHP 7.3 var_dump(preg_match('~[\s-0-9]~', '-')); // aprés un raccourci de classe de caractères var_dump(preg_match('~[\p{N}-G]~', '-')); // aprés une classe UNICODE var_dump(preg_match('~[[:xdigit:]-G]~', '-')); // aprés une classe POSIX
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/f99lc
function name:  (null)
number of ops:  64
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                               'var_dump'
          1        INIT_FCALL                                               'preg_match'
          2        SEND_VAL                                                 '%7E%5B-abc%5D%7E'
          3        SEND_VAL                                                 '-'
          4        DO_ICALL                                         $0      
          5        SEND_VAR                                                 $0
          6        DO_ICALL                                                 
    4     7        INIT_FCALL                                               'var_dump'
          8        INIT_FCALL                                               'preg_match'
          9        SEND_VAL                                                 '%7E%5Babc-%5D%7E'
         10        SEND_VAL                                                 '-'
         11        DO_ICALL                                         $2      
         12        SEND_VAR                                                 $2
         13        DO_ICALL                                                 
    5    14        INIT_FCALL                                               'var_dump'
         15        INIT_FCALL                                               'preg_match'
         16        SEND_VAL                                                 '%7E%5B%5E-abc%5D%7E'
         17        SEND_VAL                                                 'A'
         18        DO_ICALL                                         $4      
         19        SEND_VAR                                                 $4
         20        DO_ICALL                                                 
    7    21        INIT_FCALL                                               'var_dump'
         22        INIT_FCALL                                               'preg_match'
         23        SEND_VAL                                                 '%7E%5Ba-z-0%5D%7E'
         24        SEND_VAL                                                 '-'
         25        DO_ICALL                                         $6      
         26        SEND_VAR                                                 $6
         27        DO_ICALL                                                 
    8    28        INIT_FCALL                                               'var_dump'
         29        INIT_FCALL                                               'preg_match'
         30        SEND_VAL                                                 '%7E%5Ba-z-%5Cs%5D%7E'
         31        SEND_VAL                                                 '-'
         32        DO_ICALL                                         $8      
         33        SEND_VAR                                                 $8
         34        DO_ICALL                                                 
    9    35        INIT_FCALL                                               'var_dump'
         36        INIT_FCALL                                               'preg_match'
         37        SEND_VAL                                                 '%7E%5Ba-z-0-9%5D%7E'
         38        SEND_VAL                                                 '-'
         39        DO_ICALL                                         $10     
         40        SEND_VAR                                                 $10
         41        DO_ICALL                                                 
   13    42        INIT_FCALL                                               'var_dump'
         43        INIT_FCALL                                               'preg_match'
         44        SEND_VAL                                                 '%7E%5B%5Cs-0-9%5D%7E'
         45        SEND_VAL                                                 '-'
         46        DO_ICALL                                         $12     
         47        SEND_VAR                                                 $12
         48        DO_ICALL                                                 
   14    49        INIT_FCALL                                               'var_dump'
         50        INIT_FCALL                                               'preg_match'
         51        SEND_VAL                                                 '%7E%5B%5Cp%7BN%7D-G%5D%7E'
         52        SEND_VAL                                                 '-'
         53        DO_ICALL                                         $14     
         54        SEND_VAR                                                 $14
         55        DO_ICALL                                                 
   15    56        INIT_FCALL                                               'var_dump'
         57        INIT_FCALL                                               'preg_match'
         58        SEND_VAL                                                 '%7E%5B%5B%3Axdigit%3A%5D-G%5D%7E'
         59        SEND_VAL                                                 '-'
         60        DO_ICALL                                         $16     
         61        SEND_VAR                                                 $16
         62        DO_ICALL                                                 
         63      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 8.0.0


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