validate_username() – Function | Developer.WordPress.org

Checks whether a username is valid.

Parameters

$usernamestringrequired: Username.

Return

bool Whether username given is valid.

More Information

This function attempts to sanitize the username, and if it “passes”, the name is considered valid. For additional logic, you can use the ‘validate_username‘ hook.

Source

 * @since 2.0.0
 *
 * @param string $username The username to check for existence.
 * @return int|false The user ID on success, false on failure.
 */
function username_exists( $username ) {
	$user = get_user_by( 'login', $username );
	if ( $user ) {
		$user_id = $user->ID;
	} else {
		$user_id = false;
	}

	/**

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