How to delete a database record using php?

<?php
		include '../forms/includes/connection.php';
		
		if (isset ($_POST['Delete']))
	
	{	

		$id = $_POST['booking_request_id'];
		$sql = "DELETE from booking_requests where `booking_request_id` ='$id'";
		$query = mysqli_query ($link,$sql);
		
		
		if ($query)
	{
		header('location:whatsBooked.php');	
	}
	else
	{
		echo "Error: Record was not deleted" .mysql_error();
	}
	
	}
	
	else 
		
	echo "Error" .mysql_error();