How to move a WordPress installation to a subdirectory

Move all your WP installation to the subdirectory, Then uodate in your DB (wp_options by default) the siteurl and home with the new url. change https://example.com to https://example.com/blog You need also to replace all ocurrences of example.com to example.com/blog in your DB manually, with SQL or with a plugin such Better Search Replace

All new plugins generating 311 chars of unexpected output?

Basically it goes like this (relevant steps only): plugins.php page calls activate_plugin() function. Function starts output buffering. Includes plugin file. Fires activate_plugin action. Fires ‘activate_’ . trim( $plugin ) action. Fires activated_plugin action. If buffer is not empty it creates WP_Error object and returns it. plugins.php page checks for error and displays error message. So … Read more

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)