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<?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 Param
	function sayHello($name = 'World'){
		echo "Hello $name<br>";
	}

	//sayHello('Joe');
	//sayHello('Bob');
	//sayHello('Tim');

	// 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>";
?>