PHP (/pi:. eɪtʃ. pi: / English PHP: Hypertext Preprocessor — “PHP: hypertext preprocessor”; originally PHP/FI (Personal Home Page / Form Interpreter), and later called Personal Home Page Tools — “Tools for creating personal web pages”) is a general-purpose scripting language that is intensively used for developing web applications. Currently, it is supported by the vast majority of hosting providers and is one of the leaders among the languages used to create dynamic websites.

The language and its interpreter (Zend Engine) are being developed by a group of enthusiasts as part of an open source project. The project is distributed under its own license, which is incompatible with the GNU GPL.