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<?php // the filter_* functions trim whitespace which can result in data loss var_dump(filter_var(" 1 ", FILTER_VALIDATE_INT)); // because filter_var casts passed values to a string, it accepts various unsafe values var_dump(filter_var(true, FILTER_VALIDATE_INT)); var_dump(filter_var(new NotAnInt(), FILTER_VALIDATE_INT)); var_dump(filter_var(1.00000000000001, FILTER_VALIDATE_INT)); class NotAnInt { function __toString() { return " 1"; } }
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/ESUbN
function name:  (null)
number of ops:  32
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    4     0  E >   INIT_FCALL                                               'var_dump'
          1        INIT_FCALL                                               'filter_var'
          2        SEND_VAL                                                 '+++1++++'
          3        SEND_VAL                                                 257
          4        DO_ICALL                                         $0      
          5        SEND_VAR                                                 $0
          6        DO_ICALL                                                 
    7     7        INIT_FCALL                                               'var_dump'
          8        INIT_FCALL                                               'filter_var'
          9        SEND_VAL                                                 <true>
         10        SEND_VAL                                                 257
         11        DO_ICALL                                         $2      
         12        SEND_VAR                                                 $2
         13        DO_ICALL                                                 
    8    14        INIT_FCALL                                               'var_dump'
         15        INIT_FCALL                                               'filter_var'
         16        NEW                                              $4      'NotAnInt'
         17        DO_FCALL                                      0          
         18        SEND_VAR                                                 $4
         19        SEND_VAL                                                 257
         20        DO_ICALL                                         $6      
         21        SEND_VAR                                                 $6
         22        DO_ICALL                                                 
    9    23        INIT_FCALL                                               'var_dump'
         24        INIT_FCALL                                               'filter_var'
         25        SEND_VAL                                                 1
         26        SEND_VAL                                                 257
         27        DO_ICALL                                         $8      
         28        SEND_VAR                                                 $8
         29        DO_ICALL                                                 
   11    30        DECLARE_CLASS                                            'notanint'
   15    31      > RETURN                                                   1

Class NotAnInt:
Function __tostring:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/ESUbN
function name:  __toString
number of ops:  3
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   13     0  E > > RETURN                                                   '++1'
   14     1*       VERIFY_RETURN_TYPE                                       
          2*     > RETURN                                                   null

End of function __tostring

End of class NotAnInt.

Generated using Vulcan Logic Dumper, using php 8.0.0


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