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[WordPress] Highlight an Active Submenu in the Back-End
<?php
add_filter( 'parent_file', 'acme_highlight_draft_submenu' );
/**
* Highlights the 'Draft' submenu item using WordPress native styles.
*
* @param string $parent_file The filename of the parent menu.
*
* @return string $parent_file The filename of the parent menu.
*/
function acme_highlight_draft_submenu( $parent_file ) {
global $submenu_file;
// Only update the submenu file value if we're on the Draft page.
if ( 'draft' === get_query_var( 'post_status' ) ) {
$args = array( 'post_status' => 'draft', );
// Use the full URL so get the admin URL and concatenate it with the parent file.
$admin_url = trailingslashit( get_admin_url() );
$url = sprintf( '%s%s', $admin_url, $parent_file );
$submenu_file = add_query_arg( $args, $url );
}
return $parent_file;
}
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