Web Reference: Functions ¶ Table of Contents ¶ User-defined functions Function parameters and arguments Returning values Variable functions Internal (built-in) functions Anonymous functions Arrow Functions First class callable syntax 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. Built-in PHP Functions are divided into logical categories such as string functions, array functions, mathematical functions, date and time functions, file system functions, and security-related functions.
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