PHP 的 _GET 不支持 if()

Question

I'm using the following code:

if(isset($_GET['TDEnderEmail']) || htmlspecialchars($_GET['TDEnderEmail'])){
  $VEENFSL = strval($_GET['TDEnderEmail']);
  if(strpos($VEENFSL, "@enderadel.cf") > 0 && strlen($VEENFSL) > 5 && strlen($VEENFSL) < 22){
    return true;
  }
}

and although that $VEENFSL 's if (strpos($VEENFSL, "@enderadel.cf") > 0 && strlen($VEENFSL) > 5 && strlen($VEENFSL) < 22 ) statements values are turn for the example - user@enderadel.cf - if() never return a true

Answer 1

Be warned that strpos doesn't work like you probably think it does: as the documentation states, strpos

Returns the position of where the needle exists relative to the beginning of the haystack string (independent of offset). Also note that string positions start at 0, and not 1.

Returns FALSE if the needle was not found.

Warning This function may return Boolean FALSE, but may also return a non-Boolean value which evaluates to FALSE. Please read the section on Booleans for more information. Use the === operator for testing the return value of this function.

This means that your example string probably matches at position 0, therefore

strpos($VEENFSL, "@enderadel.cf") > 0

is false .

Therefore, you should replace that with

strpos($VEENFSL, "@enderadel.cf") !== false