Title: PHP Error
Last modified: November 19, 2022

---

# PHP Error

 *  Resolved [rockstaremperor](https://wordpress.org/support/users/rockstaremperor/)
 * (@rockstaremperor)
 * [3 years, 6 months ago](https://wordpress.org/support/topic/php-error-554/)
 * Hi,
    My WordPress site is on PHP 8.1. I am using the following scripts via a 
   code snippet
 *     ```
       function blogger_query_vars_filter( $vars ) {
         $vars[] = "blogger";
         return $vars;
       }
   
       add_filter('query_vars', 'blogger_query_vars_filter');
   
       function blogger_template_redirect() {
         global $wp_query;
         $blogger = $wp_query->query_vars['blogger'];
         if ( isset ( $blogger ) ) {
           wp_redirect( get_wordpress_url ( $blogger ) , 301 );
           exit;
         }
       }
   
       add_action( 'template_redirect', 'blogger_template_redirect' );
   
       function get_wordpress_url($blogger) {
         if ( preg_match('@^(?:https?://)?([^/]+)(.*)@i', $blogger, $url_parts) ) {
           $query = new WP_Query ( 
             array ( "meta_key" => "blogger_permalink", "meta_value" => $url_parts[2] ) );
           if ($query->have_posts()) { 
             $query->the_post();
             $url = get_permalink(); 
           } 
           wp_reset_postdata(); 
         } 
         return $url ? $url : home_url();
       }
       ```
   
 * Though the code is working fine, I am getting PHP errors as below
 *     ```
       PHP Warning:  Undefined array key "blogger" in /home/lsudlknf/public_html/wp-content/plugins/code-snippets/php/snippet-ops.php(505) : eval()'d code on line 10
       ```
   
 * Please help.

Viewing 3 replies - 1 through 3 (of 3 total)

 *  Plugin Author [Shea Bunge](https://wordpress.org/support/users/bungeshea/)
 * (@bungeshea)
 * [3 years, 6 months ago](https://wordpress.org/support/topic/php-error-554/#post-16214524)
 * You need to check whether the `blogger` key exists _before_ attempting to access
   it:
 *     ```
       add_filter( 'query_vars', function ( $vars ) {
       	$vars[] = 'blogger';
       	return $vars;
       } );
   
       add_action( 'template_redirect', function () {
       	global $wp_query;
       	if ( array_key_exists( 'blogger', $wp_query->query_vars ) ) {
       		wp_redirect( get_wordpress_url( $wp_query->query_vars['blogger'] ), 301 );
       		exit;
       	}
       } );
   
       function get_wordpress_url( $blogger ) {
       	$url = '';
   
       	if ( preg_match( '@^(?:https?://)?([^/]+)(.*)@i', $blogger, $url_parts ) ) {
       		$query = new WP_Query ( array( 'meta_key' => 'blogger_permalink', 'meta_value' => $url_parts[2] ) );
       		if ( $query->have_posts() ) {
       			$query->the_post();
       			$url = get_permalink();
       		}
       		wp_reset_postdata();
       	}
       	return $url ? $url : home_url();
       }
       ```
   
 *  Thread Starter [rockstaremperor](https://wordpress.org/support/users/rockstaremperor/)
 * (@rockstaremperor)
 * [3 years, 6 months ago](https://wordpress.org/support/topic/php-error-554/#post-16214555)
 * I did not understand. Where do I check?
    Above is a Redirection code from Blogger
   to WordPress and the redirection is working fine without problem. Error is reported
   in Error Log only.
    -  This reply was modified 3 years, 6 months ago by [rockstaremperor](https://wordpress.org/support/users/rockstaremperor/).
 *  Plugin Author [Shea Bunge](https://wordpress.org/support/users/bungeshea/)
 * (@bungeshea)
 * [3 years, 3 months ago](https://wordpress.org/support/topic/php-error-554/#post-16540600)
 * Did you try using the updated code I posted? Your snippet code contained a bug
   that was producing that error message.

Viewing 3 replies - 1 through 3 (of 3 total)

The topic ‘PHP Error’ is closed to new replies.

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 * 3 replies
 * 2 participants
 * Last reply from: [Shea Bunge](https://wordpress.org/support/users/bungeshea/)
 * Last activity: [3 years, 3 months ago](https://wordpress.org/support/topic/php-error-554/#post-16540600)
 * Status: resolved