生成大型虚拟文件的算法 [英] Algorithm to Generate a LARGE Dummy File

问题描述

有人用PHP生成了快速算法来生成大型伪文件(例如500MB-2GB)吗?

Has anyone written a Fast Algorithm that generates a LARGE dummy file in PHP, say 500MB-2GB?

推荐答案

如果您根本不关心文件内容，只需

If you don't care about the file contents at all, you can just seek to any position and write something:

$f = fopen('largefile', 'wb');
fseek($f, 2 * 1000 * 1000 * 1000, SEEK_SET);
fwrite($f, 'after 2 GB');
fclose($f);

如果操作系统和文件系统支持稀疏文件，则该文件确实会很大，但不会实际上占用了超过几个字节的磁盘空间.

If the OS and filesystem support sparse files, the file will be really big, but not actually take more than a couple of bytes of disk space.

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