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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 interpolated variable $filter at "SELECT ID, post_date, post_title, post_parent FROM $wpdb->posts WHERE post_status IN ('publish') AND post_type = '$type' ORDER BY post_title $filter"

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Detected usage of a non-sanitized input variable: $_POST['nonce']

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$_POST['nonce'] not unslashed before sanitization. Use wp_unslash() or similar

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Using exclusionary parameters, like exclude, in calls to get_posts() should be done with caution, see https://wpvip.com/documentation/performance-improvements-by-removing-usage-of-post__not_in/ for more information.

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Unescaped parameter $type used in $wpdb->get_results()\n$type used without escaping.

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Use of a direct database call is discouraged.

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

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