What best practice should be followed when passing GET parameters in a PHP form action?

When passing GET parameters in a PHP form action, it is best practice to sanitize and validate the input to prevent security vulnerabilities such as SQL injection or cross-site scripting attacks. This can be done by using PHP's filter_input function to sanitize the input data before using it in your application. 

<?php
// Sanitize and validate GET parameter before using it
$parameter = filter_input(INPUT_GET, 'parameter', FILTER_SANITIZE_STRING);

// Use the sanitized parameter in your application
echo "The parameter value is: " . $parameter;
?>

Keywords

security urlencode htmlspecialchars validation sanitization

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