Title: PHP 8.0 Bug Last modified: July 20, 2021 --- # PHP 8.0 Bug * Resolved [entrepreneuraj](https://wordpress.org/support/users/entrepreneuraj/) * (@entrepreneuraj) * [4 years, 10 months ago](https://wordpress.org/support/topic/php-8-0-bug/) * When switching openlitespeed to use lsphp80 after clearing all caches the following error message starts to show in debug mode (Testing sites are compatible). ` Fatal error: Uncaught TypeError: strpos(): Argument #1 ($haystack) must be of type string, array given in /home/sitename/public_html/wp-content/plugins/litespeed- cache/src/optimize.cls.php:223 Stack trace: #0 /home/sitename/public_html/wp- content/plugins/litespeed-cache/src/optimize.cls.php(223): strpos() #1 /home/ sitename/public_html/wp-content/plugins/litespeed-cache/src/optimize.cls.php( 764): LiteSpeed\Optimize->remove_query_strings() #2 /home/sitename/public_html/ wp-content/plugins/litespeed-cache/src/optimize.cls.php(400): LiteSpeed\Optimize- >_build_hash_url() #3 /home/sitename/public_html/wp-content/plugins/litespeed- cache/src/optimize.cls.php(300): LiteSpeed\Optimize->_optimize() #4 /home/sitename/ public_html/wp-content/plugins/litespeed-cache/src/core.cls.php(395): LiteSpeed\ Optimize::finalize() #5 [internal function]: LiteSpeed\Core->send_headers_force()# 6 /home/sitename/public_html/wp-includes/functions.php(4757): ob_end_flush() # 7 /home/sitename/public_html/wp-includes/class-wp-hook.php(292): wp_ob_end_flush_all()# 8 /home/sitename/public_html/wp-includes/class-wp-hook.php(316): WP_Hook->apply_filters()# 9 /home/sitename/public_html/wp-includes/plugin.php(484): WP_Hook->do_action()# 10 /home/sitename/public_html/wp-includes/load.php(1072): do_action() #11 [internal function]: shutdown_action_hook() #12 {main} thrown in /home/sitename/public_html/ wp-content/plugins/litespeed-cache/src/optimize.cls.php on line 223` Viewing 8 replies - 1 through 8 (of 8 total) * Plugin Support [qtwrk](https://wordpress.org/support/users/qtwrk/) * (@qtwrk) * [4 years, 10 months ago](https://wordpress.org/support/topic/php-8-0-bug/#post-14682384) * Hi, * if you are revert to 7.4 or lower , this error will be gone ? * Best regards, * Plugin Support [qtwrk](https://wordpress.org/support/users/qtwrk/) * (@qtwrk) * [4 years, 9 months ago](https://wordpress.org/support/topic/php-8-0-bug/#post-14708087) * Hi, * I’m going to mark this topic “Resolved”, due to lack of activity. * If you still need help, please feel free to re-open it. * When re-open it, please also change the topic status to “not solved” * Best regards, * Thread Starter [entrepreneuraj](https://wordpress.org/support/users/entrepreneuraj/) * (@entrepreneuraj) * [4 years, 9 months ago](https://wordpress.org/support/topic/php-8-0-bug/#post-14710647) * Downgrading to 7.4 does remove the error but PHP 7.4 reaches EOL FOR ACTIVE SUPPORT in 3 months leaving only security updates after that. * Plugin Support [qtwrk](https://wordpress.org/support/users/qtwrk/) * (@qtwrk) * [4 years, 9 months ago](https://wordpress.org/support/topic/php-8-0-bug/#post-14710817) * what’s your WP version ? * [ductm](https://wordpress.org/support/users/ductm/) * (@ductm) * [4 years, 9 months ago](https://wordpress.org/support/topic/php-8-0-bug/#post-14711463) * does this mean that the plugin should only use php 7.4 and should not be upgraded to php 8? * Thread Starter [entrepreneuraj](https://wordpress.org/support/users/entrepreneuraj/) * (@entrepreneuraj) * [4 years, 9 months ago](https://wordpress.org/support/topic/php-8-0-bug/#post-14711472) * Seems to be working now, only difference I can see is the WordPress Version auto updated. [@ductm](https://wordpress.org/support/users/ductm/) seems to work now on PHP 8.0 * [ductm](https://wordpress.org/support/users/ductm/) * (@ductm) * [4 years, 9 months ago](https://wordpress.org/support/topic/php-8-0-bug/#post-14711543) * i’m on php 8.0, when i saw this thread saying that downgrading to php 7.4 there should be no error Should I continue to use php 8.0 or downgrade to 7.4? i just want to know is this plugin currently fully compatible with php 8.0? * Plugin Support [qtwrk](https://wordpress.org/support/users/qtwrk/) * (@qtwrk) * [4 years, 9 months ago](https://wordpress.org/support/topic/php-8-0-bug/#post-14712020) * on my test WP 5.8 + LSCWP v3.6.4 + cPanel ea-php80 , it works * it could be error from other non-php8.0-compatible plugin/theme or even wordpress itself it you were on previous version Viewing 8 replies - 1 through 8 (of 8 total) The topic ‘PHP 8.0 Bug’ is closed to new replies. * ![](https://ps.w.org/litespeed-cache/assets/icon-256x256.png?rev=2554181) * [LiteSpeed Cache](https://wordpress.org/plugins/litespeed-cache/) * [Frequently Asked Questions](https://wordpress.org/plugins/litespeed-cache/#faq) * [Support Threads](https://wordpress.org/support/plugin/litespeed-cache/) * [Active Topics](https://wordpress.org/support/plugin/litespeed-cache/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/litespeed-cache/unresolved/) * [Reviews](https://wordpress.org/support/plugin/litespeed-cache/reviews/) ## Tags * [fatal](https://wordpress.org/support/topic-tag/fatal/) * 8 replies * 3 participants * Last reply from: [qtwrk](https://wordpress.org/support/users/qtwrk/) * Last activity: [4 years, 9 months ago](https://wordpress.org/support/topic/php-8-0-bug/#post-14712020) * Status: resolved