How to use filter in PHP

In this article I am going to explain about PHP filter.
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PHP Filter

PHP filter is used for security purpose. The insecure data is filtered by PHP filter.

Use of PHP filter

The web application is based on external input, so it is important that data comes from external input, it should be secure, and if you are using the PHP filter, then you should be sure , data is secure.

External data of PHP

External data of PHP comes from following mediums

  • By the form
     
  • By the cookies
     
  • Web services data
     
  • Database query results

Types of filter

There are two type of PHP filters:

  • Validating filters

    It is used for validating user input.
     
  • Sanitizing filters

    It is used to allow or disallow specified characters in a string.

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