Vertical marquee post title

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All output should be run through an escaping function (see the Security sections in the WordPress Developer Handbooks), found '$a1'.

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Detected usage of a possibly undefined superglobal array index: $_POST['vmpt_categories1']. Check that the array index exists before using it.

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$_POST['vmpt_categories1'] not unslashed before sanitization. Use wp_unslash() or similar

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

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Using __FILE__ for menu slugs risks exposing filesystem structure.

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query_posts() is discouraged. Use WP_Query instead.

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

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Mismatched text domain. Expected 'vertical-marquee-post-title' but got 'wp-anything-slider'.

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