wp-includes/class-wp-user.php:203Returns only the main user fields.
$fieldstring$valuestring|intobject|false public static function get_data_by( $field, $value ) { global $wpdb; // 'ID' is an alias of 'id'. if ( 'ID' === $field ) { $field = 'id'; } if ( 'id' === $field ) { // Make sure the value is numeric to avoid casting objects, for example, to int 1. if ( ! is_numeric( $value ) ) { return false; } $value = (int) $value; if ( $value < 1 ) { return false; } } else { $value = trim( $value ); } if ( ! $value ) { return false; } switch ( $field ) { case 'id': $user_id = $value; $db_field = 'ID'; break; case 'slug': $user_id = wp_cache_get( $value, 'userslugs' ); $db_field = 'user_nicename'; break; case 'email': $user_id = wp_cache_get( $value, 'useremail' ); $db_field = 'user_email'; break; case 'login': $value = sanitize_user( $value ); $user_id = wp_cache_get( $value, 'userlogins' ); $db_field = 'user_login'; break; default: return false; } if ( false !== $user_id ) { $user = wp_cache_get( $user_id, 'users' ); if ( $user ) { return $user; } } $user = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM $wpdb->users WHERE $db_field = %s LIMIT 1", $value ) ); if ( ! $user ) { return false; } update_user_caches( $user ); return $user; }Introduced in 3.3.0. Unchanged from 6.7.7 through 7.1.0.
Signature, return type and hooks compared across 5 parsed releases.
src/wp-includes/class-wp-user.php, and regenerated for each WordPress release so it tracks the code rather than a snapshot of it.