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<?php var_dump(filter_var(null, FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE)); var_dump(filter_var(false, FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE)); var_dump(filter_var(true, FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE)); var_dump(filter_var('test', FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/cBDRY
function name:  (null)
number of ops:  33
compiled vars:  none
line      #* E I O op                               fetch          ext  return  operands
-----------------------------------------------------------------------------------------
    3     0  E >   INIT_FCALL                                                   'var_dump'
          1        INIT_FCALL                                                   'filter_var'
          2        SEND_VAL                                                     null
          3        SEND_VAL                                                     258
          4        SEND_VAL                                                     134217728
          5        DO_ICALL                                             $0      
          6        SEND_VAR                                                     $0
          7        DO_ICALL                                                     
    4     8        INIT_FCALL                                                   'var_dump'
          9        INIT_FCALL                                                   'filter_var'
         10        SEND_VAL                                                     <false>
         11        SEND_VAL                                                     258
         12        SEND_VAL                                                     134217728
         13        DO_ICALL                                             $2      
         14        SEND_VAR                                                     $2
         15        DO_ICALL                                                     
    5    16        INIT_FCALL                                                   'var_dump'
         17        INIT_FCALL                                                   'filter_var'
         18        SEND_VAL                                                     <true>
         19        SEND_VAL                                                     258
         20        SEND_VAL                                                     134217728
         21        DO_ICALL                                             $4      
         22        SEND_VAR                                                     $4
         23        DO_ICALL                                                     
    6    24        INIT_FCALL                                                   'var_dump'
         25        INIT_FCALL                                                   'filter_var'
         26        SEND_VAL                                                     'test'
         27        SEND_VAL                                                     258
         28        SEND_VAL                                                     134217728
         29        DO_ICALL                                             $6      
         30        SEND_VAR                                                     $6
         31        DO_ICALL                                                     
         32      > RETURN                                                       1

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