is_email() is a PHP function that checks the validity of an email address. It tests whether the given address conforms to the followings RFCs: 5321, 5322, 4291, 2821, 2822, 3696, and 1123 (section 2.1).
Open source project that offer summary and download services on this page is a project that carry out their development work on other open source development sites. Their work is linked to this page via a feature called OFI, and their work is not carried out here on OSDN site.
