What are the common mistakes or errors that can occur when using DELETE queries in PHP and MySQL?

One common mistake when using DELETE queries in PHP and MySQL is not properly sanitizing user input, which can lead to SQL injection attacks. To prevent this, always use prepared statements with placeholders to securely pass user input to the query. 

// Connect to database
$pdo = new PDO('mysql:host=localhost;dbname=mydatabase', 'username', 'password');

// Prepare the DELETE query with a placeholder for the user input
$stmt = $pdo->prepare("DELETE FROM table_name WHERE id = :id");

// Bind the user input to the placeholder
$stmt->bindParam(':id', $_POST['id']);

// Execute the query
$stmt->execute();

Keywords

PHP MySQL DELETE query syntax error data loss

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