Title: php warning
Last modified: January 9, 2024

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# php warning

 *  [Camilo](https://wordpress.org/support/users/camilo517/)
 * (@camilo517)
 * [2 years, 4 months ago](https://wordpress.org/support/topic/php-warning-465/)
 * 3881283#0: *1057958 FastCGI sent in stderr: “PHP message: PHP Warning: Undefined
   variable $output in [/var/www/vhosts/test.es/httpdocs/wp-content/plugins/woocommerce-sendinblue-newsletter-subscription/src/managers/admin-manager.php](https://146.59.153.130/smb/file-manager/code-editor?currentDir=%2Fhttpdocs%2Fwp-content%2Fplugins%2Fwoocommerce-sendinblue-newsletter-subscription%2Fsrc%2Fmanagers&subscriptionId=48&file=admin-manager.php&redirect=%2Fsmb%2Flog-file%2Fbrowser%2Fid%2F48)
   on line 101″ while reading response header from upstream

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 * 0 replies
 * 1 participant
 * Last reply from: [Camilo](https://wordpress.org/support/users/camilo517/)
 * Last activity: [2 years, 4 months ago](https://wordpress.org/support/topic/php-warning-465/)
 * Status: not resolved