Filtering data with PHP (Sanitizing data) and Validation

http://www.phpro.org/tutorials/Filtering-Data-with-PHP.html

http://code.tutsplus.com/tutorials/sanitize-and-validate-data-with-php-filters--net-259

http://www.sitepoint.com/input-validation-using-filter-functions/

To filter arrays:

http://stackoverflow.com/questions/19637210/post-variable-array-and-filter-input




http://php.net/manual/en/function.filter-input.php

http://php.net/manual/en/filter.constants.php

http://php.net/manual/en/function.filter-input-array.php

http://php.net/manual/en/filter.filters.php

http://php.net/manual/en/filter.filters.validate.php