The WordPress open-source content management system (CMS) will show warnings in its backend admin panel if the site runs on top of an outdated PHP version. From a report: The current plan is to have the warnings appear for sites using a PHP version prior to the 5.6.x branch (5.6 or lower). The warnings will contain a link to a WordPress support page with information on how site owners can update their server’s underlying PHP version. In instances where site owners are running their WordPress portals on top of tightly-controlled web hosting environments, the web host has the option to change this link with a custom URL pointing at its own support site. […] Around 66.7 percent of all Internet sites run an unsupported PHP version, according to W3Techs. Almost a quarter of all internet sites run on top of a WordPress CMS.