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Functions declared in the global namespace by a theme/plugin should start with the theme/plugin prefix. Found: "add_hmd_links".

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

Processing form data without nonce verification.

Hook names invoked by a theme/plugin should start with the theme/plugin prefix. Found: "hmd_check_date_expired".

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.

Short URL detected (bit.ly). Use full URLs instead of URL shorteners.

date() is affected by runtime timezone changes which can cause date/time to be incorrectly displayed. Use gmdate() instead.

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.

Detected usage of a non-sanitized input variable: $_GET['dismiss-notice-verify']

$_GET['dismiss-notice-verify'] not unslashed before sanitization. Use wp_unslash() or similar

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