slider using php to get data from my database but only can get the first row of my database's data

I think that the problem should be inside my loop function. This is the code for the loop function for my database, i'm new to php and spent days looking for a solution but didn't had any luck. Any help would be appreciated thanks. https://github.com/yongzhi123/slidder-php-code/blob/main/php%20loop%20function

source https://stackoverflow.com/questions/67853104/slider-using-php-to-get-data-from-my-database-but-only-can-get-the-first-row-of