How can HTTP Authentication be utilized in PHP to restrict access to specific data only after entering login credentials?

To restrict access to specific data in PHP using HTTP Authentication, you can use the `$_SERVER['PHP_AUTH_USER']` and `$_SERVER['PHP_AUTH_PW']` variables to check if the user has entered valid login credentials. You can then use these variables to authenticate the user and restrict access to the desired data based on their credentials. 

if (!isset($_SERVER['PHP_AUTH_USER']) || !isset($_SERVER['PHP_AUTH_PW']) || ($_SERVER['PHP_AUTH_USER'] != 'username' || $_SERVER['PHP_AUTH_PW'] != 'password')) {
    header('WWW-Authenticate: Basic realm="Restricted Area"');
    header('HTTP/1.0 401 Unauthorized');
    echo 'Access Denied';
    exit;
}

// Code to display restricted data goes here

Keywords

HTTP Authentication PHP login credentials restrict access specific data

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