How to create function in PHP with example [ detailed explanation with demo]

The real power of PHP comes from its functions; it has more than 1000 built-in functions.

Besides the built-in PHP functions, we can create our own functions.

A function is a block of statements that can be used repeatedly in a program.

A function will not execute immediately when a page loads.

A function will be executed by a call to the function.
Create a User Defined Function in PHP
A user defined function declaration starts with the word "function":

Syntax
function functionName() {
code to be executed;
}
Note: A function name can start with a letter or underscore (not a number).

Tip: Give the function a name that reflects what the function does!

Function names are NOT case-sensitive.

In the example below, we create a function named "writeMsg()". The opening curly brace ( { ) indicates the beginning of the function code and the closing curly brace ( } ) indicates the end of the function. The function outputs "Hello world!". To call the function, just write its name:

Example
?php
function writeMsg() {
echo "Hello world!";
}

writeMsg(); // call the function
?
PHP Function Arguments
Information can be passed to functions through arguments. An argument is just like a variable.

Arguments are specified after the function name, inside the parentheses. You can add as many arguments as you want, just separate them with a comma.

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