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WordPress – How to create a “Must-Use” plugin (mu-plugins)

    https://www.itsupportguides.com/knowledge-base/wordpress/wordpress-how-to-create-a-must-use-plugin/
    Jun 19, 2017 · applies to all sites in a multi-site WordPress install Being ran earlier in the loop is important when you need to ensure your code runs before another plugin. To create a “Must-Use” plugin you will need access to the files and folders on your server – this may be through your web host’s “cPanel” account or FTP.

wp_get_mu_plugins() Function WordPress Developer Resources

    https://developer.wordpress.org/reference/functions/wp_get_mu_plugins/
    function wp_get_mu_plugins() { $mu_plugins = array(); if ( ! is_dir( WPMU_PLUGIN_DIR ) ) { return $mu_plugins; } $dh = opendir( WPMU_PLUGIN_DIR ); if ( ! $dh ) { return $mu_plugins; } while ( ( $plugin = readdir( $dh ) ) !== false ) { if ( '.php' === substr( $plugin, -4 ) ) { $mu_plugins[] = WPMU_PLUGIN_DIR . '/' . $plugin; } } closedir( $dh ); sort( $mu_plugins ); return …
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