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<?php
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'/>
<input type='submit' name='submit' value='submit'/>
</form>
</body>
</html>
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; values override older values.
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