Copy file from url to my own server remains file to 0mb - php

Question

I'm facing to a problem and I'm not really sure if this is the right way of doing this. I need to copy a file from a remote server to my server with php.
I use the following script :
public function download($file_source, $file_target) {
$rh = fopen($file_source, 'rb');
$wh = fopen($file_target, 'w+b');
if (!$rh || !$wh) {
return false;
}
while (!feof($rh)) {
if (fwrite($wh, fread($rh, 4096)) === FALSE) {
return false;
}
echo ' ';
flush();
}
fclose($rh);
fclose($wh);
return true;
}
but in the end, the file size remains at 0.
EDIT : I update my question, because there are still some things I didn't understand :
About fread, I used 2048mb. But it didn't work.
I found the script above, which uses 4096mb.
My question : How to determine which quantity of memory (?) to use in order no get the file downloaded anytime ? Because this one works on a specific machine (dedicated), but will it on a shared host, if I cannot modify the php.ini ?
Thanks again

Answer 1

filesize() expects a filename/path. You're passing in a filehandle, which means filesize will FAIL and return a boolean false.
You then use that false as the size argument for your fread, which gets translated to an integer 0. So essentially you're sitting there telling php to read a file, 0 bytes at a time.
You cannot reliably get the size of a remote file anyways, so just have fread some fixed number of bytes, e.g. 2048, at a time.
while(!feof($handle)) {
$contents = fread($handle, 2048);
fwrite($f, $contents);
}
and if that file isn't too big and/or your PHP can handle it:
file_put_contents('local.mp4', file_get_contents('http://whatever/foo.mp4'));