PHP function is a block of code that performs a specific task. PHP Functions are used to organize and modularize code by breaking down large programs into smaller, reusable parts.

Functions can be defined by the user and can take one or more parameters as input, perform some operations on those parameters, and return a result.

PHP has more than 1000 built-in functions that can be used for various purposes such as string manipulation, math operations, array operations, date and time manipulation, and more.

Advantage of PHP Functions:

1. Code Reusability: Functions allow you to write reusable code that can be called multiple times from different parts of your program. This can save a lot of time and effort in writing and maintaining code.
2. Less Code: It saves a lot of code because you don’t need to write the logic many times. By the use of function, you can write the logic only once and reuse it.
3. Easy to understand: PHP functions separate the programming logic. So it is easier to understand the flow of the application because every logic is divided in the form of functions.

Built-in Functions: PHP has thousands of built-in functions. For a complete reference and examples, you can go to this link<https://www.php.net/manual/en/funcref.php>.

PHP User-defined Functions

In User-defined function, We can declare and call user-defined functions easily. Let’s see the syntax to declare user-defined functions.

<?php 
Function functionName(){
//Code
}
functionName(); // Calling Function
?>

Example:

<?php
function greetingMsg() {
  echo "Good Morning!";
}
greetingMsg(); // calling function
?>

Output: Good Morning!

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