How to correctly use Contact Form 7's 'wpcf7_before_send_mail' filter in Wordpress to intercept the contact form before the email is sent.
Why you get the 'Non-static method … should not be called statically' message from PHP and what to do about it.
A brief example of how to use the PHP built-in web server for testing and development purposes.
Fixing PHP sessions, which seem to be timing out too soon since PHP 7. The problem lies with where the sessions are saved.