Http authorization 实现简单的网页用户密码验证

<code><span><span><?php </span><span>if</span> (!<span>isset</span>(<span>$_SERVER</span>[<span>'PHP_AUTH_USER'</span>])) {
    header(<span>'WWW-Authenticate: Basic realm="My Realm"'</span>);
    header(<span>'HTTP/1.0 401 Unauthorized'</span>);
    <span>echo</span><span>'Text to send if user hits Cancel button'</span>;
    <span>exit</span>;
} <span>else</span> {
    <span>echo</span><span>"<p>Hello {$_SERVER['PHP_AUTH_USER']}.</p>"</span>;
    <span>echo</span><span>"<p>You entered {$_SERVER['PHP_AUTH_PW']} as your password.</p>"</span>;
}
<span>?></span></span></span></code>