Hypertext Preprocessor (or simply PHP) is a general-purpose programming language and is probably the most popular scripting language on the web.
PHP is a widely-used open source general-purpose scripting language that is especially suited for web development and can be embedded into HTML. The best things about using PHP are that it is extremely simple for a newcomer while offering many advanced features for an experienced developer
PHP is easy to learn and is supported by all major web servers making it the most preferred web development language.
Added to the small learning curve PHP has tons of libraries, packages, and frameworks available for free.
PHP has great community support and much of the web today use PHP as the back-end, Facebook and WordPress being the most popular of PHP Development.