PHP Type hinting Type Hinting No Return(Void)


Example

In PHP 7.1, the void return type was added. While PHP has no actual void value, it is generally understood across programming languages that a function that returns nothing is returning void. This should not be confused with returning null, as null is a value that can be returned.

function lacks_return(): void {
    // valid
}

Note that if you declare a void return, you cannot return any values or you will get a fatal error:

function should_return_nothing(): void {
    return null; // Fatal error: A void function must not return a value
}

However, using return to exit the function is valid:

function returns_nothing(): void {
    return; // valid
}