functions.php

<?php
	
	# FUNCTION - Block of code that can be repeatedly called
	
	/*
		Camel Case - myFunction()
		Lower Case - my_function()
		Pascal Case - MyFunction()
	 */
	
	// Create Simple Function
	function simpleFunction() {
		echo "Hello World";
	}

	// Run Simple Function
	// simpleFunction();

	// Function with Params and Default Values
	function sayHello($name = 'World') {
		echo "Hello $name<br>";
	}	

	// sayHello('Joe');
	// sayHello('Bob');
	// sayHello();
	
	// Return Value
	function addNumbers($num1, $num2) {
		return $num1 + $num2;
	}

	// echo addNumbers(2, 3);

	// By Reference
	$myNum = 10;

	function addFive($num) { 
		$num += 5;
	}

	function addTen(&$num) {
		$num += 10;
	}

	addFive($myNum);
	echo "Value: $myNum<br>";

	addTen($myNum);
	echo "Value: $myNum<br>";
?>