WooCommerce

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Use placeholders and $wpdb->prepare(); found interpolated variable $count_clause at "SELECT $count_clause FROM {$wpdb->prefix}wc_orders_meta WHERE meta_key=%s AND meta_value=%s"

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Hook names invoked by a theme/plugin should start with the theme/plugin prefix. Found: "'add_meta_boxes_' . $this->screen_id".

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Processing form data without nonce verification.

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

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Hook names invoked by a theme/plugin should start with the theme/plugin prefix. Found: "$action".

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$_GET['_wpnonce'] 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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Attempting a database schema change is discouraged.

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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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date() is affected by runtime timezone changes which can cause date/time to be incorrectly displayed. Use gmdate() instead.

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Detected usage of meta_query, possible slow query.

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The parameter ""child_of=$id&menu_order=ASC&hide_empty=0"" at position #2 of get_terms() has been deprecated since WordPress version 4.5.0. Instead do not pass the parameter.

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Interfaces declared by a theme/plugin should start with the theme/plugin prefix. Found: "CronExpression_FieldInterface".

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Unescaped parameter $column used in $wpdb->get_row()\n$column assigned unsafely at line 266.

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