Web Reference: With that said, yes, some input needs sanitizing more than other input, since some data is used in higher-risk scenarios. I would advise sanitizing all user input through some generic function if possible and use MySQLi or PDO to auto-escape any data to fend-off injection risks. Can be a validation filter by using one of the FILTER_VALIDATE_ * constants, a sanitization filter by using one of the FILTER_SANITIZE_ * or FILTER_UNSAFE_RAW, or a custom filter by using FILTER_CALLBACK. Sanitizing Variables prevents users from being able to submit data to a database such as HTML formatting or JavaScript code. filter_var works based off of specific filters that you designate that can be found at: https://www.php.net/manual/en/filter.filters.sanitize.php
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