How Can php know if the image has been loaded fully? - php

Question

I wrote a PHP script which simply gets URL for images and tries to download/save them on server.
My problem here is that sometimes the image is not fully loaded and the codes blow only save images partially. I did some research but couldn't figure out if I can add something to it, so it can check whether it is saving the full image or not.
Images sizes and other properties of images are random so I can't check it with those factors unless there is a way that I can get those info before loading them image.
Thank you all.
if ( $leng >= "5" ) {
define('UPLOAD_DIR', dirname(__FILE__) . '/files/');
$length = 512000;
$handle = fopen($url, 'rb');
$filename = UPLOAD_DIR . substr(strrchr($url, '/'), 1);
$write = fopen($filename, 'w');
while (!feof($handle))
{
$buffer = fread($handle, $length);
fwrite($write, $buffer);
}
fclose($handle);
fclose($write);
}else {Echo "failed";}

Answer 1

I think that using cURL is a better solution than using fopen for url. Check this out:
$file = fopen($filename, 'wb'); //Write it as a binary file - like image
$c = curl_init($url);
curl_setopt($c, CURLOPT_FILE, $file);
curl_setopt($c, CURLOPT_FOLLOWLOCATION, true); //Allow cURL to follow redirects (but take note that this does not work with safemode enabled)
curl_exec($c);
$httpCode = curl_getinfo($c, CURLINFO_HTTP_CODE); //200 means OK, you may check it later, just for sure
curl_close($c);
fclose($file);
Partially based on Downloading a large file using curl