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Im creating a food menu to practice php and sql databases. In my database I have food names and given prices for those foods.in my table I have a number input box that asks the users to enter a quantity for the amount of food they want. After the user clicks the submit button it will display the total amount, How do I do this.
This is my database info
CREATE TABLEproduct (productname varchar(30) NOT NULL,price double NOT NULL,
)
INSERT INTOproduct (productname,price) VALUES
('Pizza', 3.99),
('Fires', 1.99),
('water', 0.99),
('Cheese Balls', 2.99),
('Hot Dog', 2.99);
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
table,
tr,
th,
td {
border: solid 1px black;
}
</style>
</head>
<body>
<?php
echo '<form action="">';
echo"<h1>Food Menu</h1>";
$conn = mysqli_connect("localhost","root","","FoodMenu") or die("Missing Input. Go back and enter ID or Name");
$query = "select productname,price from product" ;
$r= mysqli_query($conn, $query);
echo"<p></p>";
echo"<table>";
echo"<tr><th>product</th><th>price</th><th>Quantity</th></tr>";
while($row = mysqli_fetch_assoc($r)){
printf("<tr><td>%s</td><td>%s</td><td>%s</td></tr>", $row["productname"],$row["price"], '<input type="number" id="quantity" name="quantity" value="0" min="0" max="5">');
}
echo"</table>";
echo '<p><input type="submit">';
echo '</form>';
?>
</body>
</html>You could create a variable before the while loop, and inside the while loop you apply an increment to it as follows:
$total = 0.00;
while($row = mysqli_fetch_assoc($r)){
printf("<tr><td>%s</td><td>%s</td><td>%s</td></tr>", $row["productname"],$row["price"], '<input type="number" id="quantity" name="quantity" value="0" min="0" max="5">');
$total += $row["price"];
}
//and then you can print the total price below the table or inside it like this:
print "<strong>Total: $total</strong>";
You should also make sure you avoid mysql injection in your code.
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