get_current_user_id()

Gets the current user’s ID.

Return

(int) The current user's ID, or 0 if no user is logged in.

Source

File: wp-includes/user.php 

function get_current_user_id() {
	if ( ! function_exists( 'wp_get_current_user' ) )
		return 0;
	$user = wp_get_current_user();
	return ( isset( $user->ID ) ? (int) $user->ID : 0 );
}

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Changelog

Changelog
Version Description
MU (3.0.0) Introduced. MU (3.0.0)