What potential security risks should be considered when passing parameters in a URL in PHP?

When passing parameters in a URL in PHP, it is important to consider the potential security risks such as injection attacks, exposing sensitive information, and tampering with data. To mitigate these risks, it is recommended to sanitize and validate the parameters before using them in your application. 

// Sanitize and validate URL parameters
$param1 = filter_input(INPUT_GET, 'param1', FILTER_SANITIZE_STRING);
$param2 = filter_input(INPUT_GET, 'param2', FILTER_VALIDATE_INT);

// Use the sanitized and validated parameters in your application
echo "Param1: " . $param1 . "<br>";
echo "Param2: " . $param2;

Keywords

SQL injection cross-site scripting (XSS) URL encoding PHP $_GET input validation

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