How Can I Securely Fetch Data from MySQL Using PHP Prepared Statements and URL Parameters?

Creating Secure MySQL Prepared Statements in PHP

Fortifying MySQL queries against malicious input is crucial for maintaining data integrity and preventing SQL injection attacks. Prepared statements offer an effective mechanism for achieving this by sanitizing incoming user input.

In your specific case, you aim to fetch columns from a table using information derived from URL parameters. To secure this query, we can utilize prepared statements as follows:

$db = new mysqli("host","user","pw","database");
$stmt = $db->prepare("SELECT * FROM mytable WHERE userid=? AND category=? ORDER BY id DESC");
$stmt->bind_param('ii', intval($_GET['userid']), intval($_GET['category']));
$stmt->execute();

This statement accomplishes the following:

• Prepares a parameterized SQL query.
• Binds the GET parameters to safe integers, preventing SQL injection.
• Executes the statement.

Regarding the potential speed enhancements, prepared statements generally improve performance in scenarios with repetitive queries. However, for occasional usage on a single page, the impact may be negligible.

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