Dropdown multisite selector

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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 '$args['after_title']'.

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Missing $domain parameter in function call to __().

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

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Detected usage of a non-sanitized input variable: $_POST['multisite']

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

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Function "get_sites()" requires WordPress 4.6.0, but your plugin minimum supported version is WordPress 3.8.0.

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Resource version not set in call to wp_enqueue_style(). This means new versions of the style may not always be loaded due to browser caching.

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

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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.