What steps can be taken to ensure the security and integrity of a PHP script that allows users to delete database records based on user input?

To ensure the security and integrity of a PHP script that allows users to delete database records based on user input, you should validate and sanitize the user input to prevent SQL injection attacks. Additionally, you should implement proper authentication and authorization checks to ensure that only authorized users can delete records. 

<?php
// Validate and sanitize user input
$record_id = filter_input(INPUT_POST, 'record_id', FILTER_SANITIZE_NUMBER_INT);

// Check if user is authorized to delete record
if ($user_is_authorized) {
    // Connect to database
    $conn = new mysqli($servername, $username, $password, $dbname);

    // Check connection
    if ($conn->connect_error) {
        die("Connection failed: " . $conn->connect_error);
    }

    // Prepare and execute SQL query to delete record
    $sql = "DELETE FROM records WHERE id = ?";
    $stmt = $conn->prepare($sql);
    $stmt->bind_param("i", $record_id);
    $stmt->execute();

    // Close connection
    $stmt->close();
    $conn->close();
    
    echo "Record deleted successfully";
} else {
    echo "You are not authorized to delete this record";
}
?>

Keywords

SQL injection input validation prepared statements CSRF protection data sanitization

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