Fetching Multiple Rows, but Updating only One php - php

Question

How do you update only one row when you fetch for multiple rows? I am lost on how to do this. I can fetch for one row, update and it works. However, I'm stuck for multiple rows.
Down below is my code
FETCH PHP:
//loop through for results
while($row = mysqli_fetch_array($data)){
echo "<tr><td>"
. $row['title']."<input type='hidden' value='".$row['title']."' name='title'>"
. "</td><td>"
. $row['author']
. "</td><td>"
. $row['summary']
. "</td><td>"
. $row['isbn']
. "</td><td>"
. "<img src='books/".$row['image']."' width='100%'/>"
. "</td><td>"
. "$<input type='text' value='".$row['price']."' size='8' class='pricetoright' name='price'>"
. "</td><td>"
. "<button type='submit' class='btn btn-default btngreen' name='update'>Update</button>"
. "</td><td>"
. "<button type='submit' class='btn btn-default btnred' name='delete'>Delete</button>"
. "</td></tr>";
}
UPDATE PHP:
// Check Connection
if(!($db = mysqli_connect($server, $user, $password, $database))) {
die('SQL ERROR: Connection failed: '.mysqli_error($db));
}
$price = floatval($_POST["price"]);
$title = $_REQUEST["title"];
// SQL to update a record
$query = "UPDATE books SET price = '$price' WHERE title = '$title'";
if (mysqli_query($db, $query)) {
echo "Record updated successfully";
} else {
echo "Error updating record: " . mysqli_error($db);
}
mysqli_close($db);

Answer 1

Use form tag for each row. Also its better to use unique id to update row instead of title. So take hidden input of id.

Answer 2

You'd want to add a foreach() statement into your code. While it's a little unclear on your code here's a possible example:
foreach($_POST as $k=>$v){
if($k === "title"){
$title = $_POST["title"];
}
if($k === "price"){
$price = floatval($_POST["price"]);
}
// SQL to update a record
$query = "UPDATE books SET price = '$price' WHERE title = '$title'";
if (mysqli_query($db, $query)) {
echo "Record updated successfully";
} else {
echo "Error updating record: " . mysqli_error($db);
}
}