Post Sliders & Post Grids

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

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In footer ($in_footer) is not set explicitly wp_enqueue_script; It is recommended to load scripts in the footer. Please set this value to `true` to load it in the footer, or explicitly `false` if it should be loaded in the header.

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Detected usage of tax_query, possible slow query.

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Processing form data without nonce verification.

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

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wp_reset_query() is discouraged. Use wp_reset_postdata() instead.

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Using exclusionary parameters, like post__not_in, 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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File operations should use WP_Filesystem methods instead of direct PHP filesystem calls. Found: is_writable().

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

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Missing "License" in Plugin Header. Please update your Plugin Header with a valid GPLv2 (or later) compatible license.