Custom WooCommerce Checkout Fields Editor

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$_GET['section'] not unslashed before sanitization. Use wp_unslash() or similar

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

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The $text parameter must be a single text string literal. Found: $fields[$name]['maxlength']

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Function "get_network()" requires WordPress 4.6.0, but your plugin minimum supported version is WordPress 4.5.0.

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

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Detected usage of meta_key, possible slow query.

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Detected usage of meta_value, possible slow query.

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

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The plugin name includes a restricted term. Your chosen plugin name - "Custom WooCommerce Checkout Fields Editor" - contains the restricted term "woocommerce" which cannot be used within in your plugin name, unless your plugin name contains one of the allowed patterns: "for woocommerce", "with woocommerce", "using woocommerce", or "and woocommerce". The term must still not appear anywhere else in your name.

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Offloading images, js, css, and other scripts to your servers or any remote service is disallowed.

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Unescaped parameter $query used in $wpdb->get_results()\n$query assigned unsafely at line 608.

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Attempting a database schema change is discouraged.

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