SQL injection occurs when an attacker can inject malicious SQL code into a web application's database in order to manipulate the data it holds. A basic example of how an attacker might exploit an id parameter in a URL could look something like this:

In the malicious URL, if the PHP code doesn't properly sanitize the input (for example, if it directly uses the id parameter in a SQL query without escaping), the attacker can manipulate the query. The server might execute a query like:

SELECT * FROM users WHERE id = 1 OR 1=1

This would return all rows from the users table, allowing the attacker unauthorized access to user information.

// Secure method using PDO
$stmt = $pdo->prepare("SELECT * FROM products WHERE id = :id");
$stmt->execute(['id' => $_GET['id']]);

Use robots.txt to discourage indexing of dynamic URLs, though this is not a security control:

Disallow: /*?id=

If you run a website that uses ?id= parameters, you are a target. Here is the defensive checklist:

Inurl Php Id 1 Link ★ Verified

SELECT * FROM users WHERE id = 1 OR 1=1

This would return all rows from the users table, allowing the attacker unauthorized access to user information. SQL injection occurs when an attacker can inject

// Secure method using PDO
$stmt = $pdo->prepare("SELECT * FROM products WHERE id = :id");
$stmt->execute(['id' => $_GET['id']]);

Use robots.txt to discourage indexing of dynamic URLs, though this is not a security control: In the malicious URL, if the PHP code

Disallow: /*?id=

If you run a website that uses ?id= parameters, you are a target. Here is the defensive checklist: