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number validation


harkly

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When dealing with numbers do I need to implement all the security?

 

On in-putting into my DB I have all numbers validating, with a case statement, and I use prepared statements.

 

So when pulling number data do I need to sanitize it as well?

 

The types are smallint() or tinyint()

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If you're using prepared statements and binding the parameters, nothing needs to be done to prevent SQL injection - it is escaped internally.

 

If you weren't using prepared statements, all you would have to do is type-cast the input to make sure it is an integer. Type-casting effectively strips all non-integer characters, and thus it can't be harmful.

 

$number = (int) $_POST['number']; // perfectly safe for SQL

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