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<?php function is_base64($s) { return (bool) preg_match('/^[a-zA-Z0-9\/\r\n+]*={0,2}$/', $s); } var_dump(is_base64("dfdf")); var_dump(is_base64("CkRldmljZSBOYW1lIC0gTW9kZWw6IDx1bmtub3duPiAtIEhVQVdFSSBIVUFXRUkgWTMwMC0wMTAwCk9wZXJhdGluZyBTeXN0ZW06IEFuZHJvaWQgT1MgNC4xLjEgLyBBUEktMTYgKEh1YXdlaVkzMDAtMDEwMC9DNDc5QjE5Nyk="));
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/16uCv
function name:  (null)
number of ops:  13
compiled vars:  none
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    7     0  E >   INIT_FCALL                                               'var_dump'
          1        INIT_FCALL                                               'is_base64'
          2        SEND_VAL                                                 'dfdf'
          3        DO_FCALL                                      0  $0      
          4        SEND_VAR                                                 $0
          5        DO_ICALL                                                 
    8     6        INIT_FCALL                                               'var_dump'
          7        INIT_FCALL                                               'is_base64'
          8        SEND_VAL                                                 'CkRldmljZSBOYW1lIC0gTW9kZWw6IDx1bmtub3duPiAtIEhVQVdFSSBIVUFXRUkgWTMwMC0wMTAwCk9wZXJhdGluZyBTeXN0ZW06IEFuZHJvaWQgT1MgNC4xLjEgLyBBUEktMTYgKEh1YXdlaVkzMDAtMDEwMC9DNDc5QjE5Nyk%3D'
          9        DO_FCALL                                      0  $2      
         10        SEND_VAR                                                 $2
         11        DO_ICALL                                                 
         12      > RETURN                                                   1

Function is_base64:
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/16uCv
function name:  is_base64
number of ops:  8
compiled vars:  !0 = $s
line      #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
    2     0  E >   RECV                                             !0      
    4     1        INIT_FCALL                                               'preg_match'
          2        SEND_VAL                                                 '%2F%5E%5Ba-zA-Z0-9%5C%2F%5Cr%5Cn%2B%5D%2A%3D%7B0%2C2%7D%24%2F'
          3        SEND_VAR                                                 !0
          4        DO_ICALL                                         $1      
          5        BOOL                                             ~2      $1
          6      > RETURN                                                   ~2
    5     7*     > RETURN                                                   null

End of function is_base64

Generated using Vulcan Logic Dumper, using php 8.0.0


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