Web Reference: PHP has over 1000 built-in functions that can be called directly, from within a script, to perform a specific task. Please check out our PHP reference for a complete overview. PHP already holds hundreds of built-in functions that you use in your everyday applications, but in PHP you have the ability to create your own functions. There are two types of functions - library functions and user functions. Library functions, such as array_push are part of the PHP library and can be used by anyone. However, you may write your own functions and use them across your code. A function receives a list of arguments separated by commas.
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