download.php

<?php
$filelistPath = "filelist.txt";
$baseURL = "http://url-with-images.com/";

// ------------

$filelist = file($filelistPath);

function downloadFile($url, $target) {
  global $baseURL;

	$ch = curl_init();
	$fp = fopen($target, "w+");
	$timeout = 60;

	curl_setopt($ch, CURLOPT_URL, $baseURL . $url);
	curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
	curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);
	curl_setopt($ch, CURLOPT_FILE, $fp);
	curl_exec($ch);
	curl_close($ch);

}

$ts = microtime(true);

$zipPath = "zipped/".date("Y-m-d_H:i:s_").uniqid().".zip";

$zip = new ZipArchive();

if($zip->open($zipPath, ZIPARCHIVE::CREATE) !== true) {
	die("Failed to create zip file");
} else {
	echo "\nZip file created: $zipPath";
}

echo "\nDownloading ".sizeof($filelist)." files...\n";

$num = 0;
foreach($filelist as $file) {

	$file = trim($file);

	echo "\nFile: {$file}... ";

	$localFile = "downloaded/".basename($file);
	downloadFile($file, $localFile);

	echo "DOWNLOADED!";

	$zip->addFile($localFile);

	echo " ...ZIPPED!";

	$num++;

}

$zip->close();

$te = microtime(true);
$tt = $te - $ts;
$timeTotal = sprintf("%.3f", $tt / 1000);

die("\n\nCompleted! Downloaded {$num} files in {$timeTotal} seconds");