PHP stands for :
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Personal Home Page
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Personal Hypertext Processor
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PHP: Hypertext Preprocessor
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Private Home Page
PHP originally stood for 'Personal Home Page' when created by Rasmus Lerdorf in 1994. As the language evolved into a general-purpose scripting language, the meaning was changed to a recursive acronym 'PHP: Hypertext Preprocessor' to reflect its focus on server-side web development and distinguish it from its original purpose. This recursive naming convention (like GNU = GNU's Not Unix) is common in open source projects.
PHP originally stood for 'Personal Home Page' but was later recursively redefined as 'PHP: Hypertext Preprocessor,' which is the current official expansion of the acronym. This recursive naming style is common in open-source tools (GNU is another example).