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var_dump($_GET['a'],$_POST['a'],$_REQUEST['a']);
?>
<html>
<head><title>demo</title></head>
<body>
<form method= 'post' action = 'req.php?a=xxx'>
<input type='hidden' name='a' value='yyy'/>
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</body>
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; Environment and Built-in variables (G, P, C, E & S respectively, often
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; values override older values.
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