How can PHP be used to detect if a visitor is using a specific browser, such as Firefox, when accessing a website?

To detect if a visitor is using a specific browser, such as Firefox, when accessing a website, you can use the $_SERVER['HTTP_USER_AGENT'] variable in PHP. This variable contains information about the user's browser, operating system, and other details. You can check if the user agent string contains 'Firefox' to determine if the visitor is using Firefox. 

$user_agent = $_SERVER['HTTP_USER_AGENT'];

if (strpos($user_agent, 'Firefox') !== false) {
    echo "You are using Firefox!";
} else {
    echo "You are not using Firefox.";
}

Keywords

PHP user agent browser detection $_SERVER strpos

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