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<?php
$type='a';
$target='type';
$a=array(1,2,3);
a($target);
function a($type)
{
    global $$type;
    var_dump($$type);
}
?>
Ô¤¼ÆÊä³öµÄÊÇstring(1)”a”
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Notice: Undefined variable: a in D:\web\global.php on line 11
NULL
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