Check the number of input variables submitted.

/**
 * The check_post_input_vars
 *
 * @return void
 */
function check_post_input_vars() {
	// $array = array(
	// 'sp_pcp_view_options' => array(
	// 'pcp_select_post_type' => 'post',
	// 'pcp_select_filter_product_type' => 'none',
	// 'pcp_sticky_post' => 'normal_position',
	// 'pcp_post_limit' => '20',
	// 'pcp_post_offset' => '',
	// 'pcp_advanced_filter' => array( 'sortby' ),
	// ),
	// );
		// Get the exact number of input variables in $_POST
		$input_count = count( $_POST, COUNT_RECURSIVE ) - count( $_POST );
		echo( '<pre>' );
		var_dump( $input_count );
		echo( '</pre>' );
		echo( '<pre>' );
		var_dump( $_POST );
		echo( '</pre>' );
		// Do something with the number of input variables
		// echo "Number of input variables submitted: " . $num_input_vars;
		die;
}
add_action( 'save_post', 'check_post_input_vars' );