Learn to schedule PHP script in a Cpanel CRON, Make it run at specific time interval. Once PHP completes execution in CRON, check the results in Email Inbox
Automatically backup website data to Dropbox using PHP code. Website data should be backuped up frequently to prevent years work being lost due to hacker attacks, data corruption due to hardware issues. Use this code that explains basics about how a file can be uploaded to Dropbox using PHP.
Get a fully functional Email Signup form with HTML and jQuery code. This signup form appears in the page, when the user scrolls down to the end of page. An Email Signup form with animation gets more attention rather than a static form and so the number of users register with your email list get increased.
Use this techniques to change the default WordPress excerpt length of 55 and increase it to your need. Also change the setting for Read more as explained.