pre_user_login

apply_filters('pre_user_login') is found 2 times:

• /wp-admin/user-new.php line 216

  		if ( is_wp_error( $user_details['errors'] ) && $user_details['errors']->has_errors() ) {
  			$add_user_errors = $user_details['errors'];
  		} else {
  			/** This filter is documented in wp-includes/user.php */
  			$new_user_login = apply_filters( 'pre_user_login', sanitize_user( wp_unslash( $_REQUEST['user_login'] ), true ) );
  			if ( isset( $_POST['noconfirmation'] ) && current_user_can( 'manage_network_users' ) ) {
  				add_filter( 'wpmu_signup_user_notification', '__return_false' );  // Disable confirmation email.
  				add_filter( 'wpmu_welcome_user_notification', '__return_false' ); // Disable welcome email.
  			}
  			wpmu_signup_user(
  				$new_user_login,
  

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• /wp-includes/user.php line 2121

  	 * @since 2.0.3
  	 *
  	 * @param string $sanitized_user_login Username after it has been sanitized.
  	 */
  	$pre_user_login = apply_filters( 'pre_user_login', $sanitized_user_login );
  
  	// Remove any non-printable chars from the login string to see if we have ended up with an empty username.
  	$user_login = trim( $pre_user_login );
  
  	// user_login must be between 0 and 60 characters.
  	if ( empty( $user_login ) ) {
  

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