PHP Filters Advanced

Validate an Integer Within a Range

The following example uses the filter_var() function to check if a variable is both of type INT, and between 1 and 200:

Validate IPv6 Address

The following example uses the filter_var() function to check if the variable $ip is a valid IPv6 address:

Validate URL – Must Contain QueryString

The following example uses the filter_var() function to check if the variable $url is a URL with a querystring:

Remove Characters With ASCII Value > 127

The following example uses the filter_var() function to sanitize a string. It will both remove all HTML tags, and all characters with ASCII value > 127, from the string:

Complete PHP Filter Reference

For a complete reference of all filter functions, go to our complete PHP Filter Reference. Check each filter to see what options and flags are available.

The reference contains a brief description, and examples of use, for each function!