Web Reference: You need to filter input on a whitelist -- ensure that the data matches some specification of what you expect. Then you need to escape it before you use it, depending on the context in which you are using it. Jul 12, 2025 · Therefore, to safeguard the database from hackers, it is necessary to sanitize and filter the user entered data before sending it to the database. Let's have an example of SQL injection to make the things clear. Before processing data from untrusted sources such as HTTP post or getrequest, you should always sanitize it first. Sanitizing input means removing illegal characters using deleting, replacing, encoding, or escaping techniques. PHP provides a list of sanitizing filtersthat you can use to sanitize input effectively. The following functions use these...
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