WP Flexslider

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

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The plugin name includes a restricted term. Your chosen plugin name - "WP Flexslider" - contains the restricted term "wp" which cannot be used at all in your plugin name.

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In footer ($in_footer) is not set explicitly wp_register_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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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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Hidden files are not permitted.

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

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Tested up to: 5.1 < 7.0. The "Tested up to" value in your plugin is not set to the current version of WordPress. This means your plugin will not show up in searches, as we require plugins to be compatible and documented as tested up to the most recent version of WordPress.

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