$html = <<<eot
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset={$encodeType}" />
</head>
<body onload="javascript:document.pay_form.submit();">
<form id="pay_form" name="pay_form" action="{$reqUrl}" method="post">
eot;
foreach ( $params as $key => $value ) {
$html .= " <input type=\"hidden\" name=\"{$key}\" id=\"{$key}\" value=\"{$value}\" />\n";
}
$html .= <<<eot
<!-- <input type="submit" type="hidden">-->
</form>
</body>
</html>
eot;直接用 <<<eot开头，eot结尾 即可
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