Remove plugin option for Multisite during uninstall

Author: merkys7

uninstall.php

@@ -11,4 +11,34 @@
 	exit;
 }
 
-delete_option( 'perflab_modules_settings' );
+if ( is_multisite() ) {
+	delete_data_multisite();
+} else {
+	delete_data();
+}
+
+/**
+ * Delete data for the current blog.
+ */
+function delete_data() {
+
+	delete_option( 'perflab_modules_settings' );
+}
+
+/**
+ * Delete data for multisite blogs.
+ */
+function delete_data_multisite() {
+	global $wpdb;
+
+	$blog_ids         = $wpdb->get_col( "SELECT blog_id FROM {$wpdb->blogs}" );
+	$original_blog_id = get_current_blog_id();
+
+	foreach ( $blog_ids as $current_blog_id ) {
+		switch_to_blog( $current_blog_id );
+
+		delete_data();
+	}
+
+	switch_to_blog( $original_blog_id );
+}