Simple PHP Script to obtain SSL Certificate Information

We need a simple PHP script that will get and show information about the SSL certificate on a given URL. Deliverables: 1) Create web from that allows user to insert a website URL. (e.g. [login to view URL]) 2) Ensure input does not contain extra information (e.g. http, //, / ...) 3) The script will then query that host for it's SSL certificate 4) If certificate is found then display the "serial number" field from the certificate information. (eg "0a82ef83e4cc4036aef3677a29f5ebc0" please note the format of the charaters) ## Deliverables Script must be written in PHP