Images corrupted after copying - php

Question

Trying to copy images from remote server to use as thumbnails in my wordpress site. Some of this images become corrupted after copying.
Here's my code:
$url = 'http://media.cultserv.ru/i/1000x1000/'.$event->subevents[0]->image;
$timeout_seconds = 100;
$temp_file = download_url( $url, $timeout_seconds );
if(!is_wp_error( $temp_file )) {
$file = array(
'name' => basename($url),
'type' => wp_check_filetype(basename($url), null),
'tmp_name' => $temp_file,
'error' => 0,
'size' => filesize($temp_file),
);
$overrides = array(
'test_form' => false,
'test_size' => true,
'test_upload' => true,
);
$results = wp_handle_sideload( $file, $overrides );
if(empty($results['error'])) {
$filename = $results['file'];
$local_url = $results['url'];
$type = $results['type'];
$attachment = array(
'post_mime_type' => $results['type'],
'post_title' => preg_replace('/.[^.]+$/', '', basename( $results['file'] ) ),
'post_content' => '',
'post_status' => 'inherit',
'post_type' => 'attachment',
'post_parent' => $pID,
);
$attachment_id = wp_insert_attachment( $attachment, $filename );
if($attachment_id) {
set_post_thumbnail( $pID, $attachment_id );
}
}
}
Here's a screenshot that shows what I mean (Left - original image; Right - copy on my server):

Answer 1

I think that your download_url( $url, $timeout_seconds ) function is not working properly (you don't get to catch network/other errors, that's why you have corrupted images), also I don't think that the timeout parameter is really needed to download an url...
To fix this it's better to rewrite this function into something like this :
function download_url($url)
{
$saveto = 'temp.jpg'; // generate temp file
$ch = curl_init($url);
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_BINARYTRANSFER, 1);
$raw = curl_exec($ch);
if (curl_errno($ch)) {
curl_close($ch);
return false;
// you probably have a network problem here.
// you need to handle it, for example retry or skip and reqeue the image url
}
curl_close($ch);
if (file_exists($saveto)) {
unlink($saveto);
}
$fp = fopen($saveto, 'x');
fwrite($fp, $raw);
fclose($fp);
return $saveto;
}