UPDATE query through foreach loop in mysql/php - php

Question

I do have an array something like this:
[cuisines] => Array
(
[0] => 17
[1] => 20
[2] => 23
[3] => 26
)
Now I need to update mysql table with these values. All values belong to one user.
So I tried it like this:
if (isset($_POST['cuisines'])) {
$cuisines = $_POST['cuisines'];
} else {
$error_alert[] = "Please select at least one cuisine";
}
if (empty($error_alert)) { // If everything's OK...
// Make the update query:
$sql = 'UPDATE restaurant_cuisines
SET restaurant_id = ?
, cuisine_id = ?
WHERE restaurant_id = ?';
$stmt = $mysqli->prepare($sql);
// Bind the variables:
$stmt->bind_param('iii', $restaurant_id, $cuisine_id, $restaurant_id);
foreach ($cuisines as $value) {
$cuisine_id = $value;
// Execute the query:
$stmt->execute();
}
// Print a message based upon the result:
if ($stmt->affected_rows >= 1) {
echo 'updated';
}
// Close the statement:
$stmt->close();
unset($stmt);
}
But this query not updating mysql correctly. This is what I get running this script.
mysql> select * from restaurant_cuisines where restaurant_id = 4;
+---------------+------------+
| restaurant_id | cuisine_id |
+---------------+------------+
| 4 | 26 |
| 4 | 26 |
| 4 | 26 |
+---------------+------------+
3 rows in set (0.00 sec)
What would be the problem of this script?
Hope somebody may help me out.
Thank you.

Answer 1

You need to bind your parameters in the loop:
// Delete old entries:
$sqlDelete = 'DELETE FROM restaurant_cuisines WHERE restaurant_id = ?';
$stmtDelete = $mysqli->prepare($sqlDelete);
$stmtDelete->bind_param($restaurant_id);
$stmtDelete->execute();
$stmtDelete->close();
unset($stmtDelete);
// now prepare to insert new values
$sqlInsert = 'INSERT INTO restaurant_cuisines (restaurant_id,cuisine_id)
VALUES (?,?)';
$stmtInsert = $mysqli->prepare($sqlInsert);
foreach ($cuisines as $value) {
// Bind the variables:
$stmtInsert->bind_param($restaurant_id, $value);
// Execute the query:
$stmtInsert->execute();
// Print a message based upon the result:
if ($stmtInsert->affected_rows >= 1) {
echo 'updated';
}
}
// Close the statement:
$stmtInsert->close();
unset($stmtInsert);