My site’s home page stopped working when I switched server’s PHP version from 7.4 to 8.2. Looking into the error.log (in root directory, not in modx manager page) I saw the following error was thrown.
PHP Fatal error: Uncaught TypeError: implode(): Argument #2 ($array) must be of type ?array, string given in /..../public_html/web1/core/components/spiefeed/includes/simplepie/simplepie_1.3.mini.php:11420
simplepie is used by spiefeed extra and I am using this extra to include my blog entries maintained in WP site
Googling “simplepie php8” quickly found this article.
So, I downloaded the later version of simplepie.php (I used 1.6, The latest is 1.8 but the file size is twice as big with the 1.8), saved to includes/simplepie folder under /core/spiefeed and point to this file instead of simplepie_1.3.mini.php from spifee.snippet.php (line 253)
My home page is now showing under both PHP7.4 and PHP8.2 so this action seems to have fixed the problem.
I filed a bug report to spiefeed github page but I dont see much traffic there so just in case I am reporting this here.