├── testFiles
    ├── 1.jpg
    ├── 2.jpg
    └── 3.jpg
├── README.md
└── index.php


/testFiles/1.jpg:
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https://raw.githubusercontent.com/ArturGrigio/php-Zip-Download-of-Large-Files-using-Buffer/HEAD/testFiles/1.jpg


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/testFiles/2.jpg:
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https://raw.githubusercontent.com/ArturGrigio/php-Zip-Download-of-Large-Files-using-Buffer/HEAD/testFiles/2.jpg


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/testFiles/3.jpg:
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https://raw.githubusercontent.com/ArturGrigio/php-Zip-Download-of-Large-Files-using-Buffer/HEAD/testFiles/3.jpg


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/README.md:
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 1 | #Zip Files for Download using the buffer
 2 | 
 3 | This rep will allows you to create a zip file on the clients device without creating a zip file on the server, and is very light in sense of processing overhead.
 4 | 
 5 | ##Possible Uses
 6 | 
 7 | * If you have several files and the user has to pick the ones he wants before download, this rep will allow you to force a download instantly (without creating a zip file on the server first).
 8 | * If you have large files to serve to the client.
 9 | 
10 | Credits to: [Lee on StackOverflow](http://stackoverflow.com/users/416630/lee) for help.


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/index.php:
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 1 | <?php 
 2 | 	$files = array("testFiles/1.jpg", "testFiles/2.jpg", "testFiles/3.jpg");
 3 | 
 4 | 	//Getting the total size of the files array
 5 | 	$totalSize = 0;
 6 | 	foreach ($files as $file) {
 7 | 		$totalSize += filesize($file);
 8 | 	}
 9 | 	$totalSize += 300; //I don't understand why, but the totalSize is always 300kb short of the correct size
10 | 
11 | 	header('Pragma: no-cache'); 
12 | 	header('Content-Description: File Download'); 
13 | 	header('Content-disposition: attachment; filename="myZip.zip"');
14 | 	header('Content-Type: application/octet-stream');
15 | 	header('Content-Length: ' . $totalSize);
16 | 	header('Content-Transfer-Encoding: binary'); 
17 | 
18 | 	//Opening a zip stream
19 | 	$files = implode(" ", $files);
20 | 	if ($files){
21 | 		$fp = popen('zip -r -0 - ' . $files, 'r');
22 | 	}
23 | 	
24 | 	flush(); //Flushing the butter, pre streaming
25 | 	while(!feof($fp)) {
26 | 	   	echo fread($fp, 8192);
27 | 	}
28 | 
29 | 	//Closing the stream
30 | 	if ($files){ 
31 | 		pclose($fp);
32 | 	}
33 | ?>


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