pre_user_nicename

apply_filters('pre_user_nicename') is found 1 times:

• /wp-includes/user.php line 2306

  	 * @since 2.0.3
  	 *
  	 * @param string $user_nicename The user's nicename.
  	 */
  	$user_nicename = apply_filters( 'pre_user_nicename', $user_nicename );
  
  	// Check if the sanitized nicename is empty.
  	if ( empty( $user_nicename ) ) {
  		return new WP_Error( 'empty_user_nicename', __( 'Cannot create a user with an empty nicename.' ) );
  	} elseif ( mb_strlen( $user_nicename ) > 50 ) {
  		return new WP_Error( 'user_nicename_too_long', __( 'Nicename may not be longer than 50 characters.' ) );
  

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