<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<?php
$title = 'test';
echo "<title>$title </title>";
?>
</head>
<body>
</body>
为什么标题 显示不是test ,而是未定义标题 呢,请教高手,谢谢
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