What common mistakes are users making when creating PHP links with parameters like index.php?cmd=kurs&bez=men?

Users commonly forget to properly sanitize input parameters when creating PHP links with parameters like index.php?cmd=kurs&bez=men. This can lead to security vulnerabilities such as SQL injection or cross-site scripting attacks. To prevent this, always sanitize user input before using it in a query or outputting it to the browser. 

$cmd = isset($_GET['cmd']) ? filter_var($_GET['cmd'], FILTER_SANITIZE_STRING) : '';
$bez = isset($_GET['bez']) ? filter_var($_GET['bez'], FILTER_SANITIZE_STRING) : '';

Keywords

PHP URL parameters security vulnerabilities code injection validation.

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