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<?php echo "\n** warning about bad pattern AND bad parameter: **\n"; var_dump(preg_match('bad pattern', null)); echo "\n** warning about bad pattern only: **\n"; var_dump(preg_match('bad pattern', '')); echo "\n** suppressed warnings: **\n"; var_dump(@preg_match('bad pattern', ''));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/5YI6t
function name:  (null)
number of ops:  18
compiled vars:  none
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   ECHO                                                         '%0A%2A%2A+warning+about+bad+pattern+AND+bad+parameter%3A+%2A%2A%0A'
    4     1        INIT_FCALL                                                   'var_dump'
          2        FRAMELESS_ICALL_2                preg_match          ~0      'bad+pattern', null
          3        SEND_VAL                                                     ~0
          4        DO_ICALL                                                     
    6     5        ECHO                                                         '%0A%2A%2A+warning+about+bad+pattern+only%3A+%2A%2A%0A'
    7     6        INIT_FCALL                                                   'var_dump'
          7        FRAMELESS_ICALL_2                preg_match          ~2      'bad+pattern', ''
          8        SEND_VAL                                                     ~2
          9        DO_ICALL                                                     
    9    10        ECHO                                                         '%0A%2A%2A+suppressed+warnings%3A+%2A%2A%0A'
   10    11        INIT_FCALL                                                   'var_dump'
         12        BEGIN_SILENCE                                        ~4      
         13        FRAMELESS_ICALL_2                preg_match          ~5      'bad+pattern', ''
         14        END_SILENCE                                                  ~4
         15        SEND_VAL                                                     ~5
         16        DO_ICALL                                                     
         17      > RETURN                                                       1

Generated using Vulcan Logic Dumper, using php 8.5.0


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