CodesJava

Easy learning with example program codes

Posted on by

A function is a piece of code that can be used repeatedly in a PHP program. A function is mainly of two types:

Syntax:

function functionName(parameters) 
{
    code to be executed;
}

Rules for using Functions:

Name of a function should not start with a number. It can start with a letter or underscore.
Name of a function are case-insensitive.
A function starts with an opening curly brace ( { ) and ends with a closing curly brace ( } ).
Arguments are the variables, inside the parentheses, after the function name which is used to pass informations to functions.
For multiple arguments, comma should be used for separation.
Default argument value can also be specified in a function. If no argument is specified, the function will take the default argument.
Functions can also be used to return value.

Example

<!DOCTYPE html>
<html>
<body>
 
<?php
function writeMsg() {
	echo "My First Program using Function!";
}
 
writeMsg();
?>
 
</body>
</html>

Output

My First Program using Function!