What are some common mistakes to avoid when combining SQL queries with PHP arrays?

One common mistake to avoid when combining SQL queries with PHP arrays is not properly sanitizing user input, which can lead to SQL injection attacks. To prevent this, always use prepared statements with parameterized queries to safely pass user input to the database. Additionally, make sure to properly handle errors that may occur during the query execution to provide a better user experience. 

// Example of using prepared statements with parameterized queries to safely combine SQL queries with PHP arrays

// Assuming $conn is the database connection object

// Sanitize user input
$user_input = $_POST['user_input'];

// Prepare a SQL statement with a parameterized query
$stmt = $conn->prepare("SELECT * FROM table_name WHERE column_name = ?");
$stmt->bind_param("s", $user_input);

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

// Get the result set
$result = $stmt->get_result();

// Fetch the data into an array
$data = $result->fetch_all(MYSQLI_ASSOC);

// Close the statement and connection
$stmt->close();
$conn->close();

// Use the $data array as needed

Keywords

SQL injection array functions prepared statements data sanitization query optimization

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