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$_SESSION为啥不让打

WBOY
WBOYOriginal
2016-06-13 12:31:39858browse

$_SESSION为什么不让打
我想打印出$_SEEION这个数组中的结构，但是返回的却是Notice:  Undefined variable: _SESSION in D:\wamp\www\test.php on line 3  记得以前打印$_SERVER很容易就出来，不知这个是为什么

<?php<br />
    echo '<pre class="brush:php;toolbar:false">';<br />
    print_r($_SESSION);<br />
    echo '
';
?>

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