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Hook names invoked by a theme/plugin should start with the theme/plugin prefix. Found: "$filter_name . '_content'".

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Global variables defined by a theme/plugin should start with the theme/plugin prefix. Found: "$content".

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Processing form data without nonce verification.

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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: $_REQUEST[$nonce_value]. Check that the array index exists before using it.

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mt_rand() is discouraged. Use the far less predictable wp_rand() instead.

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