What potential issue could arise from using $_GET['var'] to retrieve a value in PHP?

One potential issue that could arise from using $_GET['var'] to retrieve a value in PHP is the vulnerability to security risks such as SQL injection attacks. To solve this issue, it is recommended to sanitize and validate the input data before using it in your application. 

// Sanitize and validate input data before using it
$var = isset($_GET['var']) ? filter_var($_GET['var'], FILTER_SANITIZE_STRING) : '';

// Now you can safely use $var in your application

Keywords

$_GET security vulnerabilities SQL injection cross-site scripting data validation

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