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如何使用PHP获取网络上文件

Jun 13, 2016 pm 12:44 PM
php s superior use how document use network Obtain set up


//设置我们将要使用的文件
$srcurl = "http://localhost/index.php";
$tempfilename = "tempindex.html";
$targetfilename = "index.html";
?>


<br>Generating <?php echo("$targetfilename"); ?><br>


Generating ...


//首先删除上次操作可能遗留下来的临时文件。
//这个过程可能会提示错误,所以我们使用@以防止报错。
@unlink($tempfilename);
//通过一个URL的请求装入动态版本。
//在我们接收到相关内容之前,Web服务器会对PHP进行处理
//(因为本质上我们是在模拟一个Web浏览器),
//所以我们将获得的是一个静态的HTML页面。
//'r'指出我们只要求对这个“文件”进行读操作。
$dynpage = fopen($srcurl, 'r');
//处理错误
if (!$dynpage) {
echo("

Unable to load $srcurl. Static page ".
"update aborted!

");
exit();
}
//将这个URL的内容读入到一个PHP变量中。
//指定我们将读取1MB的数据(超过这个数据量一般是意味着出错了)。
$htmldata = fread($dynpage, 1024*1024);
//当我们完成工作后,关闭到源“文件”的连接。
fclose($dynpage);
//打开临时文件(同时在这个过程中建立)以用来写入(注意'w'的用法).
$tempfile = fopen($tempfilename, 'w');
//处理错误
if (!$tempfile) {
echo("

Unable to open temporary file ".
"($tempfilename) for writing. Static page ".
"update aborted!

");
exit();
}
//将静态页面的数据写入到临时文件中
fwrite($tempfile, $htmldata);
//完成写入后,关闭临时文件。
fclose($tempfile);
//如果到了这里,我们应该已经成功地写好了一个临时文件,
//现在我们可以用它来覆盖原来的静态页面了。
$ok = copy($tempfilename, $targetfilename);
//最后删除这个临时文件。
unlink($tempfilename);
?>

Static page successfully updated!





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