Zip chunks with PHP (split ZIP with max size)

zip-chunks.php

<?php // Run as `php zip-chunks.php path/to/directory`.

$chunk_limit = 1024 * 1024 * 1024; // 1 GB

function get_files( $path ) {
	$files = glob( rtrim( $path, '\\/' ) . '/*' );
	foreach ( $files as $file ) {
		if ( is_dir( $file ) ) {
			$files = array_merge( $files, get_files( $file ) );
		}
	}
	return array_filter( $files, 'is_file' );
}

// Zip all files in the current directory by default.
$lookup_path = getcwd();

// Allow specifying a custom path to a directory to zip.
if ( ! empty( $argv[1] ) ) {
	$lookup_path = realpath( $argv[1] );
}

// Get all the file sizes.
$files = [];
foreach ( get_files( $lookup_path ) as $file ) {
	$files[ $file ] = filesize( $file );
}

$chunks = [];
$chunk_size = 0;
foreach ( $files as $file => $filesize ) {
	$chunk_size += $filesize;
	$chunks[ floor( $chunk_size / $chunk_limit ) ][ $file ] = $filesize;
}

foreach ( $chunks as $chunk => $chunk_files ) {
	printf( 
		'Creating chunk %d/%d (%d MB limit) with %d files (%d MB).' . "\n",
		$chunk + 1, 
		count( $chunks ),
		$chunk_limit / 1024 / 1024,
		count( $chunk_files ),
		array_sum( $chunk_files ) / 1024 / 1024
	);

	$zip = new ZipArchive();
	$zip->open( sprintf( 'chunk-%d.zip', $chunk + 1 ), ZipArchive::CREATE );
	foreach ( $chunk_files as $file => $filesize ) {
		$zip->addFile( $file, str_replace( $lookup_path, '', $file ) );
	}
	$zip->close();
}