Title: PHP Compatibility
Last modified: October 6, 2025

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# PHP Compatibility

 *  [silvia4easytools](https://wordpress.org/support/users/silvia4easytools/)
 * (@silvia4easytools)
 * [6 months, 1 week ago](https://wordpress.org/support/topic/php-compatibility-63/)
 * Hello,
 * I need to upgrade the whole website to the latest version of PHP. I ran the PHP
   Compatibility Checker plugin to make sure it would not cause issues with existing
   plugins/themes. According to this plugin, Twenty Twenty Three 1.6 failed. Do 
   you know about this issue?
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fphp-compatibility-63%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

The topic ‘PHP Compatibility’ is closed to new replies.

 * ![](https://i0.wp.com/themes.svn.wordpress.org/twentytwentythree/1.6/screenshot.
   png)
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 * [Support Threads](https://wordpress.org/support/theme/twentytwentythree/)
 * [Active Topics](https://wordpress.org/support/theme/twentytwentythree/active/)
 * [Unresolved Topics](https://wordpress.org/support/theme/twentytwentythree/unresolved/)
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## Tags

 * [compatibility](https://wordpress.org/support/topic-tag/compatibility/)
 * [php](https://wordpress.org/support/topic-tag/php/)

 * 0 replies
 * 1 participant
 * Last reply from: [silvia4easytools](https://wordpress.org/support/users/silvia4easytools/)
 * Last activity: [6 months, 1 week ago](https://wordpress.org/support/topic/php-compatibility-63/)
 * Status: not resolved