How can a PHP developer determine which browser the user is using?

To determine which browser the user is using, a PHP developer can use the $_SERVER['HTTP_USER_AGENT'] variable to access the user's browser information. This variable contains a string that identifies the user's browser and operating system. By parsing this string, the developer can extract the browser information and make decisions based on the user's browser. 

$user_agent = $_SERVER['HTTP_USER_AGENT'];

if (strpos($user_agent, 'Firefox') !== false) {
    echo 'You are using Firefox';
} elseif (strpos($user_agent, 'Chrome') !== false) {
    echo 'You are using Chrome';
} elseif (strpos($user_agent, 'Safari') !== false) {
    echo 'You are using Safari';
} elseif (strpos($user_agent, 'Edge') !== false) {
    echo 'You are using Edge';
} else {
    echo 'You are using an unknown browser';
}

Keywords

PHP user agent browser detection get_browser() $_SERVER

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