What are the potential pitfalls of relying on HTTP_USER_AGENT for browser detection in PHP?

Relying on the HTTP_USER_AGENT for browser detection in PHP can be unreliable as user agents can be easily spoofed or modified. It's better to use feature detection or a library like Browser.php to accurately determine browser capabilities. 

require_once 'Browser.php';
$browser = new Browser();
if ($browser->getBrowser() == Browser::BROWSER_FIREFOX) {
    echo 'You are using Firefox!';
} else {
    echo 'You are not using Firefox.';
}

Keywords

HTTP_USER_AGENT browser detection PHP pitfalls user-agent string

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