What potential issues can arise from relying solely on the User-Agent header to identify the browser in PHP?

Relying solely on the User-Agent header to identify the browser in PHP can lead to inaccurate results as the User-Agent header can be easily manipulated or spoofed by users. To solve this issue, it is recommended to use additional methods such as feature detection or browser detection libraries to accurately determine the browser being used.

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