What are the potential security risks of executing SQL queries that come from the client side in PHP?

Executing SQL queries that come directly from the client side in PHP can lead to SQL injection attacks, where malicious code is injected into the query to manipulate the database or retrieve sensitive information. To prevent this, it is important to sanitize and validate user input before executing any SQL queries. 

// Sanitize and validate user input before executing SQL query
$userInput = $_POST['user_input'];
$cleanInput = mysqli_real_escape_string($connection, $userInput);

$query = "SELECT * FROM users WHERE username = '$cleanInput'";
$result = mysqli_query($connection, $query);

// Rest of the code to handle the query result

Keywords

SQL injection client-side security risks PHP execute.

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