PHP is a Hypertext Preprocessor. This essentially means that PHP dynamically writes web pages for you. So it can query a database and print a report from it, or change CSS and such based on specific criteria.
You need to name your PHP files with a .php extension for them to work on your server. Past this you use the PHP Tags to trigger scripts within a web page. <?php print “Hello […]
You can validate that variable values look how they are supposed to by using filter_var in PHP. Filter_var determines if an email address, IP address, Int, Float, etc are formatted how they are supposed to […]