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1
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<?php
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2
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function user2path($user) # multiple @ and nested . OK: a@b.c@url -> url?b.c.a
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3
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{ return implode(".", array_reverse(explode("@", $user))); }
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4
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5
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if (!isset($_SERVER["PHP_AUTH_USER"])) # browser first omits Authorization
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6
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{
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7
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header('WWW-Authenticate: Basic realm="please leave username/password blank or as filled in"');
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8
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}
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9
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else
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10
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{
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11
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$subpath = user2path($_SERVER["PHP_AUTH_USER"]);
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12
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header("Location: ".($_SERVER["PHP_AUTH_USER"] !== ""
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13
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? ($_SERVER["QUERY_STRING"] !== ""
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14
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? /*prepend to query string*/$_SERVER["SCRIPT_URL"]
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15
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."?.".$subpath.ltrim($_SERVER["QUERY_STRING"], "@")
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16
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: $_SERVER["REQUEST_URI"]/*ends in ? */.$subpath
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)
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18
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: rtrim($_SERVER["REQUEST_URI"], "?") #user empty->just display page
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19
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));
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20
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}
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21
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?>
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