Duplicate Page or Post

Mismatched text domain. Expected 'duplicate-page-or-post' but got 'wpda_duplicate'.

All output should be run through an escaping function (see the Security sections in the WordPress Developer Handbooks), found '$content'.

Resource version not set in call to wp_enqueue_script(). This means new versions of the script may not always be loaded due to browser caching.

wp_redirect() found. Using wp_safe_redirect(), along with the "allowed_redirect_hosts" filter if needed, can help avoid any chances of malicious redirects within code. It is also important to remember to call exit() after a redirect so that no other unwanted code is executed.

$_GET['post_id'] not unslashed before sanitization. Use wp_unslash() or similar

load_plugin_textdomain() has been discouraged since WordPress version 4.6. When your plugin is hosted on WordPress.org, you no longer need to manually include this function call for translations under your plugin slug. WordPress will automatically load the translations for you as needed.

The parameter "FALSE" at position #2 of load_plugin_textdomain() has been deprecated since WordPress version 2.7.0. Use "" instead.

In footer ($in_footer) is not set explicitly wp_enqueue_script; It is recommended to load scripts in the footer. Please set this value to `true` to load it in the footer, or explicitly `false` if it should be loaded in the header.

Your plugin has a different license declared in the readme file and plugin header. Please update your readme with a valid GPL license identifier.

PHP file should prevent direct access. Add a check like: if ( ! defined( 'ABSPATH' ) ) exit;

Tested up to: 6.9 < 7.0. The "Tested up to" value in your plugin is not set to the current version of WordPress. This means your plugin will not show up in searches, as we require plugins to be compatible and documented as tested up to the most recent version of WordPress.