(E-12) - Functions in PHP

A function is a piece of code that takes another input in the form of a parameter, processes it, and then returns a value.

Syntax:
function function_name(argument_list){ $arg1,$arg2,$arg3…..
// function body
}
Function signature - a formal description of types of arguments and return value of a function. It includes following
• function name
• number of arguments and their data type
• return value and its data type

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