Do not be confused by those who insist the interpretation that is called PHP make it a language; it IS closer to a library than it is to a programming language. The reason PHP is so fast and so easy to use is because it is mostly a wrapper for C functionality (such as strlen) and the extensive API contains what I would consider library functions and not language features (such as wordwrap). However, PHP IS in the process of transforming itself into a language.
PHP: The Library
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