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 in using PHP are that it is extremely simple for a newcomer, while offering many advanced features for a experienced developer
PHP is easy to learn and is supported by all major web servers making it the most prefferd web develompent language.
Added to the small learning curve PHP has tons of libraries, packages and frameworks available for free.
PHP has a great community support and much of the web today uses PHP as the back-end, Facebook and WordPress beign the most popular of PHP Development.