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User-defined functions CODE

Function that does something

function printGreeting() {
	print "Prints: Hello world!\n";
}
printGreeting();

Function that returns something

function returnGreeting() {
	return "Returns: Hello world!\n";
}
echo returnGreeting();

Parameterized function that doubles the number

function doubleMe($number) {
	$result = "$number times 2 is: " . $number * 2 . "\n";
	return $result;
}
echo doubleMe(4);

Function calculates the sum of two numbers

function add($num1, $num2) {
	$sum = $num1 + $num2;
	$result = "Sum of $num1 and $num2 is: $sum";
	return $result;
}
echo add(4, 5);

by Valeri Tandilashvili

PHP

functions

Pro tip: use ```triple backticks around text``` to write in code fences