DELETE query using PDO

1. DELETE query with positional placeholders
2. DELETE query with named placeholders
3. Comments (1)

First of all, make sure you've got a properly configured PDO connection variable that is needed in order to run SQL queries using PDO (and to inform you of the possible errors).

In order to run an DELETE query with PDO just follow the steps below:

• create a correct SQL DELETE statement
• replace all actual values with placeholders
• prepare the resulting query
• execute the statement, sending all the actual values to execute() in the form of array.

DELETE query with positional placeholders

As usual, positional placeholders are more concise and easier to use

$sql = "DELETE FROM users WHERE id=?";
$stmt= $pdo->prepare($sql);
$stmt->execute([$id]);

or you can chain execute() to prepare():

$pdo->prepare("DELETE FROM users WHERE id=?")->execute([$id]);

DELETE query with named placeholders

In case you have a predefined array with values, or prefer named placeholders in general, the code would be

$data = [
    'date' => $date,
    'used' => $used,
];
$sql = "DELETE FROM coupons WHERE used = :used AND date_active < :date";
$stmt= $pdo->prepare($sql);
$stmt->execute($data);

or you can chain execute() to prepare():

$sql = "DELETE FROM coupons WHERE used = :used AND date_active < :date";
$pdo->prepare($sql)->execute($data);

Remember that you should't wrap every query into a try..catch statement. Instead, let a possible error to bubble up to either the built-in PHP's or your custom error handler.