实例代码如下:

<form action=\"\" method=\"get\">
<select name=\"selectClass\">
  <option value=\"1\">一级</option>
  <option value=\"2\">二级</option>
</select>
<input name=\"classname\" type=\"text\" /><input name=\"\" type=\"submit\" />
</form>
<?php
if ($_SERVER[\'REQUEST_METHOD\'] == \'GET\')
{
echo \"表单提交\";
echo $_GET[\'selectClass\'];
}
?>
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