Title: PHP compatibility warnings from your plugin Last modified: February 19, 2019 --- # PHP compatibility warnings from your plugin * Resolved [moisb](https://wordpress.org/support/users/moisb/) * (@moisb) * [7 years, 3 months ago](https://wordpress.org/support/topic/php-compatibility-warnings-from-your-plugin-2/) * Hello, today I did a compatibility test to update my website from PHP 7.0.x to PHP 7.1.x. There were some warnings from your plugin. Obviously I know this does not stop the plugin, however it is interesting to check the warnings to avoid future problems πŸ™‚ * FILE: htdocs/wp-content/plugins/wp-asset-clean-up/freemius/includes/fs-essential- functions.php β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”- FOUND 0 ERRORS AND 1 WARNING AFFECTING 1 LINE β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”- 175 | WARNING | Function name β€œ__fs” is discouraged; PHP has reserved all method names with a double underscore prefix for future use. β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”β€”- Viewing 2 replies - 1 through 2 (of 2 total) * Plugin Author [Gabe Livan](https://wordpress.org/support/users/gabelivan/) * (@gabelivan) * [7 years, 3 months ago](https://wordpress.org/support/topic/php-compatibility-warnings-from-your-plugin-2/#post-11224507) * [@moisb](https://wordpress.org/support/users/moisb/), this warning is from a global function β€œ__fs” within the Freemius WordPress SDK and it will not be triggered in the front-end view. It will only be declared (never triggered) as a function within the Dashboard. The function has been replaced with fs_text(). Moreover, the PHP file uses function_exists() to check if it was already declared (to avoid further conflicts in case a different plugin uses the same SDK). * This shouldn’t stop the plugin from working in any way and in my tests, in PHP 7+ (I’m using WP_DEBUG always set to true) no warning was ever shown. * Thanks for posting this and in case I will later use my own code (this SDK is quite heavy for what I need), this kind of warnings won’t be shown again via the tools you’ve used to check for the compatibility (I suppose you used WP Engine’sβ€œ PHP Compatibility Checker” plugin). * Thread Starter [moisb](https://wordpress.org/support/users/moisb/) * (@moisb) * [7 years, 3 months ago](https://wordpress.org/support/topic/php-compatibility-warnings-from-your-plugin-2/#post-11224542) * [@gabelivan](https://wordpress.org/support/users/gabelivan/) I got it! Thank you very much for your attention. * Yes, I used the WP Engine plugin. Viewing 2 replies - 1 through 2 (of 2 total) The topic β€˜PHP compatibility warnings from your plugin’ is closed to new replies. * ![](https://ps.w.org/wp-asset-clean-up/assets/icon-256x256.png?rev=1981952) * [Asset CleanUp: Page Speed Booster](https://wordpress.org/plugins/wp-asset-clean-up/) * [Frequently Asked Questions](https://wordpress.org/plugins/wp-asset-clean-up/#faq) * [Support Threads](https://wordpress.org/support/plugin/wp-asset-clean-up/) * [Active Topics](https://wordpress.org/support/plugin/wp-asset-clean-up/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/wp-asset-clean-up/unresolved/) * [Reviews](https://wordpress.org/support/plugin/wp-asset-clean-up/reviews/) * 2 replies * 2 participants * Last reply from: [moisb](https://wordpress.org/support/users/moisb/) * Last activity: [7 years, 3 months ago](https://wordpress.org/support/topic/php-compatibility-warnings-from-your-plugin-2/#post-11224542) * Status: resolved