Widget CSS Classes

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The $domain parameter must be a single text string literal. Found: WCSSC_Lib::DOMAIN

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Global variables defined by a theme/plugin should start with the theme/plugin prefix. Found: "$blog".

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Function "get_sites()" requires WordPress 4.6.0, but your plugin minimum supported version is WordPress 3.3.0.

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The use of function wp_get_sidebars_widgets() is forbidden

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

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Processing form data without nonce verification.

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Detected usage of a non-sanitized input variable: $_FILES['widget-css-classes-settings-import-file']['tmp_name']

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Detected usage of a possibly undefined superglobal array index: $_FILES['widget-css-classes-settings-import-file']['tmp_name']. Check that the array index exists before using it.

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