Title: PHP Warning – Undefined variable $content_id
Last modified: January 9, 2024

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# PHP Warning – Undefined variable $content_id

 *  [coxy17](https://wordpress.org/support/users/coxy17/)
 * (@coxy17)
 * [2 years, 5 months ago](https://wordpress.org/support/topic/php-warning-undefined-variable-content_id/)
 * Hi, I am receiving this warning error message using the latest version of the
   plugin and woocommerce. Any ideas? thanks
 *     ```wp-block-code
       AH01071: Got error 'PHP message: PHP Warning:  Undefined variable $content_id in /home/sites/28a/3/308b2ac3f9/public_html/wp-content/plugins/social-pixel/sp-conf.php on line 177PHP message: PHP Fatal error:  Uncaught TypeError: implode(): Argument #1 ($pieces) must be of type array, string given in /home/sites/28a/3/308b2ac3f9/public_html/wp-content/plugins/social-pixel/sp-conf.php:177\nStack trace:\n#0 /home/sites/28a/3/308b2ac3f9/public_html/wp-content/plugins/social-pixel/sp-conf.php(177): implode(', ', NULL)\n#1 /home/sites/28a/3/308b2ac3f9/public_html/wp-includes/class-wp-hook.php(324): fb_viewshop('')\n#2 /home/sites/28a/3/308b2ac3f9/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array)\n#3 /home/sites/28a/3/308b2ac3f9/public_html/wp-includes/plugin.php(517): WP_Hook->do_action(Array)\n#4 /home/sites/28a/3/308b2ac3f9/public_html/wp-includes/general-template.php(3068): do_action('wp_footer')\n#5 /home/sites/28a/3/308b2ac3f9/public_html/wp-content/themes/drip-create/footer.php(10): wp_footer()\n#6 /home/sites/28a/3/308b2ac3f9/public_html/wp-includes/template.php(790): require_once('/home/sites/28a...')\n#7 /home/sites/28a/3/308b2ac3f9/public_html...'
       ```
   

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 * 0 replies
 * 1 participant
 * Last reply from: [coxy17](https://wordpress.org/support/users/coxy17/)
 * Last activity: [2 years, 5 months ago](https://wordpress.org/support/topic/php-warning-undefined-variable-content_id/)
 * Status: not resolved