What are the potential pitfalls of relying on the User Agent string to determine the browser in PHP?

Relying on the User Agent string to determine the browser in PHP can be unreliable as it can be easily manipulated or spoofed. It's better to use feature detection or server-side capabilities to determine the browser. 

$browser = get_browser(null, true);
echo $browser['browser'];

Keywords

User Agent string browser detection PHP security vulnerability spoofing

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