What potential issues can arise when using the $_SERVER superglobal array in PHP?

One potential issue when using the $_SERVER superglobal array in PHP is that it may contain user input data, making it susceptible to security vulnerabilities like injection attacks. To solve this issue, always sanitize and validate any data retrieved from $_SERVER before using it in your application. 

// Example of sanitizing data from $_SERVER
$request_method = isset($_SERVER['REQUEST_METHOD']) ? htmlspecialchars($_SERVER['REQUEST_METHOD']) : '';

Keywords

$_SERVER superglobal array security vulnerabilities sensitive data exposure server configuration errors

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