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WP_User::exists()

Determine whether the user exists in the database.

Return

(bool) True if user exists in the database, false if not.

Source

File: wp-includes/class-wp-user.php 

public function exists() {
		return ! empty( $this->ID );
	}

Changelog

Version Description
3.4.0 Introduced.

© 2003–2019 WordPress Foundation
Licensed under the GNU GPLv2+ License.
https://developer.wordpress.org/reference/classes/wp_user/exists