具体代码如下：
<?php
$head ='<?xml version="1.0" encoding="gb2312" ?>
<channel>';
$stp ='
<item>
<title>标题</title>
<link>网址</link>
<data>时间</data>
</item>
';
for($i=1;$i<=4;$i++){
$stp .=$stp;
}
$foot ='</channel>';
$cont =fopen("test.xml",'w');
fwrite($cont,$head.$stp.$foot);
fclose($cont);
?>