PHP实现从远程下载文件的方法

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<?php

if ($_GET[xfer]) {

if ($_POST[from] == "") {

print "You forgot to enter a url.";

} else {

copy("$_POST[from]", "$_POST[to]");

$size = round((filesize($_POST[to])/1000000), 3);

print "transfer complete.<br>

<a><a href=\"$_POST[from]\">$_POST[from]</a><br>

<a><a href=\"$_POST[to]\">$_POST[to]</a> : $size MB";

}

} else {

print "<form action=\"$PHP_SELF?xfer=true\" method=post>

from(http://): <input name=from><br>

to(filename): <input name=to><br>

<input type=submit value=\"transload\">";

}

?>