How can PHP be used to differentiate between Firefox and Mozilla/5 browsers?

To differentiate between Firefox and Mozilla/5 browsers in PHP, you can use the $_SERVER['HTTP_USER_AGENT'] variable to access the user agent string sent by the browser. Firefox typically includes "Firefox" in its user agent string, while other browsers like Chrome and Safari include "Mozilla/5.0". By checking for these specific strings, you can determine if the user is using Firefox or another browser. 

$user_agent = $_SERVER['HTTP_USER_AGENT'];

if (strpos($user_agent, 'Firefox') !== false) {
    echo 'User is using Firefox';
} else {
    echo 'User is not using Firefox';
}

Keywords

PHP User Agent $_SERVER strpos browser detection

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