Cornerstone

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Direct database call without caching detected. Consider using wp_cache_get() / wp_cache_set() or wp_cache_delete().

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

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The use of function create_function() is forbidden

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strip_tags() is discouraged. Use the more comprehensive wp_strip_all_tags() instead.

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Unescaped parameter $arc_query used in $wpdb->get_results()\n$arc_query assigned unsafely at line 827.

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parse_url() is discouraged because of inconsistency in the output across PHP versions; use wp_parse_url() instead.

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Found single-underscore "_()" function when double-underscore expected.

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

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Use placeholders and $wpdb->prepare(); found $arc_query

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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.

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screen_icon() has been deprecated since WordPress version 3.8.0.

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File has mixed line endings; this may cause incorrect results

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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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Use placeholders and $wpdb->prepare(); found interpolated variable $post->ID at "SELECT COUNT(*) FROM $wpdb->posts WHERE ID = $post->ID"

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get_post_to_edit() has been deprecated since WordPress version 3.5.0. Use get_post() instead.