How can a whitelist approach be implemented to prevent SQL injection in PHP scripts?

To prevent SQL injection in PHP scripts, a whitelist approach can be implemented by defining a list of allowed characters and only accepting input that matches these criteria. This can help ensure that malicious SQL commands are not executed by restricting input to only known safe values. 

// Define a whitelist of allowed characters
$whitelist = "/^[a-zA-Z0-9\s]+$/";

// Check if input matches the whitelist
if (preg_match($whitelist, $_POST['input'])) {
    // Use the input safely in SQL queries
    $safe_input = $_POST['input'];
} else {
    // Handle invalid input
    echo "Invalid input detected";
}

Keywords

SQL injection whitelist approach PHP scripts security measures parameterized queries

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