post提交
<form method="post" action="a.php" >
<input type='text'name='user'/>
<input type='submit' name='sub'/>
</form><?php
echo $_POST['user'];
?>
get提交
<form method="get" action="a.php" >
<input type='text'name='user'/>
<input type='submit' name='sub'/>
</form><?php
echo $_GET['user'];
?>
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