PHP Filter_Callback Filter
What is FILTER_CALLBACK Filter in PHP?
PHP FILTER_CALLBACK is used to call a user defined function or any PHP function to filter and validate the value. Name
: "callback" ID-number
$string="We welcome you to Hscripts.com";
echo filter_var($string, FILTER_CALLBACK, array("options"=>"ucwords"));
We Welcome You To Hscripts.com
In the above example, the first character of each word in the given sentence is capitalized.
Here the user defined functions is $string which is validated and the output is given.