PHP实现从远程下载文件的方法_php技巧

<?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.

$_POST[from]

$_POST[to] : $size MB";
}
} else {
print "

from(http://): 

to(filename): 

";
}
?>