Title: PHP Warning: Undefined array key “HTTP_HOST” in v11.75 – Still Persistent
Last modified: December 5, 2025

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# PHP Warning: Undefined array key “HTTP_HOST” in v11.75 – Still Persistent

 *  [aitbelk](https://wordpress.org/support/users/aitbelk/)
 * (@aitbelk)
 * [6 months ago](https://wordpress.org/support/topic/php-warning-undefined-array-key-http_host-in-v11-75-still-persistent/)
 * <span style=”font-size: inherit; font-family: -apple-system, BlinkMacSystemFont,"
   Segoe UI", Roboto, Oxygen-Sans, Ubuntu, Cantarell, "Helvetica Neue", sans-serif;”
   >Hello WPMobile.App Support Team,</span>
 * I am writing to you regarding a persistent PHP Warning that is appearing in my
   website’s `error_log` file. The warning originates from your plugin, even though
   I am running the latest version (v11.75).
 * <b>Error Details:</b>
    - <b>Plugin Version:</b> 11.75
    - <b>Full Warning Text:</b>
    - <response-element class=”” ng-version=”0.0.0-PLACEHOLDER”><code-block _nghost-
      ng-c3693737113=”” class=”ng-tns-c3693737113-95 ng-star-inserted”>
    -     ```ng-tns-c3693737113-95
          <code _ngcontent-ng-c3693737113="" role="text" data-test-id="code-content" class="code-container formatted ng-tns-c3693737113-95 no-decoration-radius">PHP Warning: Undefined array key "HTTP_HOST" in /wp-content/plugins/wpappninja/inc/functions/seo.php on line 20
          ```
      
    - </code-block></response-element>
    - <b>Current Code on Line 20:</b>
    - <response-element class=”” ng-version=”0.0.0-PLACEHOLDER”><code-block _nghost-
      ng-c3693737113=”” class=”ng-tns-c3693737113-96 ng-star-inserted”>
    - <span _ngcontent-ng-c3693737113=”” class=”ng-tns-c3693737113-96″>PHP</span
      >
    - <button _ngcontent-ng-c3693737113=”” aria-label=”Copier le code” mat-icon-
      button=”” mattooltip=”Copier le code” class=”mdc-icon-button mat-mdc-icon-
      button mat-mdc-button-base mat-mdc-tooltip-trigger copy-button ng-tns-c3693737113-
      96 mat-unthemed ng-star-inserted” mat-ripple-loader-uninitialized=”” mat-ripple-
      loader-class-name=”mat-mdc-button-ripple” mat-ripple-loader-centered=”” jslog
      =”179062;track:generic_click,impression;BardVeMetadataKey:[["r_ae1909ecb526c510","
      c_3f88ab4952f1499d",null,"rc_f7389293806f62ef",null,null,"en",null,1,null,
      null,1,0]];mutable:true”><span class=”mat-mdc-button-persistent-ripple mdc-
      icon-button__ripple”></span><mat-icon _ngcontent-ng-c3693737113=”” role=”img”
      fonticon=”content_copy” class=”mat-icon notranslate google-symbols mat-ligature-
      font mat-icon-no-color” aria-hidden=”true” data-mat-icon-type=”font” data-
      mat-icon-name=”content_copy”></mat-icon><span class=”mat-focus-indicator”>
      </span><span class=”mat-mdc-button-touch-target”></span></button>
    -     ```ng-tns-c3693737113-96
          <code _ngcontent-ng-c3693737113="" role="text" data-test-id="code-content" class="code-container formatted ng-tns-c3693737113-96"><span class="hljs-variable">$url</span> = <span class="hljs-variable">$_SERVER</span>[<span class="hljs-string">'HTTP_HOST'</span>] . <span class="hljs-variable">$_SERVER</span>[<span class="hljs-string">'REQUEST_URI'</span>];
          ```
      
    - </code-block></response-element>
    - <b>Issue:</b> This warning appears when the code is executed via background
      processes (like WP-Cron), where the `HTTP_HOST` value is not defined in the`
      $_SERVER` array.
 * <b>Suggested Solution (to assist with the fix):</b>
 * The warning can be avoided by checking for the key’s existence using the Null
   Coalescing Operator (`??`):
 * <response-element class=”” ng-version=”0.0.0-PLACEHOLDER”><code-block _nghost-
   ng-c3693737113=”” class=”ng-tns-c3693737113-97 ng-star-inserted”>
 * <span _ngcontent-ng-c3693737113=”” class=”ng-tns-c3693737113-97″>PHP</span>
 * <button _ngcontent-ng-c3693737113=”” aria-label=”Copier le code” mat-icon-button
   =”” mattooltip=”Copier le code” class=”mdc-icon-button mat-mdc-icon-button mat-
   mdc-button-base mat-mdc-tooltip-trigger copy-button ng-tns-c3693737113-97 mat-
   unthemed ng-star-inserted” mat-ripple-loader-uninitialized=”” mat-ripple-loader-
   class-name=”mat-mdc-button-ripple” mat-ripple-loader-centered=”” jslog=”179062;
   track:generic_click,impression;BardVeMetadataKey:[["r_ae1909ecb526c510","c_3f88ab4952f1499d",
   null,"rc_f7389293806f62ef",null,null,"en",null,1,null,null,1,0]];mutable:true”
   ><span class=”mat-mdc-button-persistent-ripple mdc-icon-button__ripple”></span
   ><mat-icon _ngcontent-ng-c3693737113=”” role=”img” fonticon=”content_copy” class
   =”mat-icon notranslate google-symbols mat-ligature-font mat-icon-no-color” aria-
   hidden=”true” data-mat-icon-type=”font” data-mat-icon-name=”content_copy”></mat-
   icon><span class=”mat-focus-indicator”></span><span class=”mat-mdc-button-touch-
   target”></span></button>
 *     ```ng-tns-c3693737113-97
       <code _ngcontent-ng-c3693737113="" role="text" data-test-id="code-content" class="code-container formatted ng-tns-c3693737113-97"><span class="hljs-variable">$url</span> = (<span class="hljs-variable">$_SERVER</span>[<span class="hljs-string">'HTTP_HOST'</span>] ?? <span class="hljs-string">''</span>) . <span class="hljs-variable">$_SERVER</span>[<span class="hljs-string">'REQUEST_URI'</span>];
       ```
   
 * </code-block></response-element>
 * We kindly request that you include this modification in the next plugin update.
 * Thank you for your time and efforts.
 * Sincerely,

Viewing 1 replies (of 1 total)

 *  Plugin Author [Amauri](https://wordpress.org/support/users/amauric/)
 * (@amauric)
 * [6 months ago](https://wordpress.org/support/topic/php-warning-undefined-array-key-http_host-in-v11-75-still-persistent/#post-18745276)
 * Can you just paste the error log and not this messy AI text? Thanks !

Viewing 1 replies (of 1 total)

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 * Last reply from: [Amauri](https://wordpress.org/support/users/amauric/)
 * Last activity: [6 months ago](https://wordpress.org/support/topic/php-warning-undefined-array-key-http_host-in-v11-75-still-persistent/#post-18745276)
 * Status: not a support question