Simple function that return total size of files in archive.
May be useful for check for zip bombs.
<?php
function get_zip_originalsize($filename) {
$size = 0;
$resource = zip_open($filename);
while ($dir_resource = zip_read($resource)) {
$size += zip_entry_filesize($dir_resource);
}
zip_close($resource);
return $size;
}
$size = get_zip_originalsize('file.zip');
echo "original size: $size bytes\n";
?>