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

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All output should be run through an escaping function (like esc_html_e() or esc_attr_e()), found '_e'.

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Processing form data without nonce verification.

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

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A function call to __() with texts containing placeholders was found, but was not accompanied by a "translators:" comment on the line above to clarify the meaning of the placeholders.

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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.

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Detected usage of a possibly undefined superglobal array index: $_REQUEST['_wpnonce']. Check that the array index exists before using it.

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

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Scripts must be registered/enqueued via wp_enqueue_script()

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