Clean before json_encode to ensure values are strings

#10937 @thenbrent

includes/class-wc-checkout.php

@@ -184,8 +184,8 @@ class WC_Checkout {
 				'status'        => apply_filters( 'woocommerce_default_order_status', 'pending' ),
 				'customer_id'   => $this->customer_id,
 				'customer_note' => isset( $this->posted['order_comments'] ) ? $this->posted['order_comments'] : '',
-				'cart_hash'     => md5( print_r( WC()->cart->get_cart_for_session(), true ) . WC()->cart->total ),
-				'created_via'   => 'checkout'
+				'cart_hash'     => md5( json_encode( wc_clean( WC()->cart->get_cart_for_session() ) ) . WC()->cart->total ),
+				'created_via'   => 'checkout',
 			);
 
 			// Insert or update the post data