PHP：随机读取文件
某个目录下有10000个txt文件，现在想随机读取其中的100个，可以怎么实现呢？
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某个目录下有10000个txt文件，现在想随机读取其中的100个，可以怎么实现呢？
遍历所有文件，生成文件名数组，array_rand从里面随机抽取，然后你就可以一一打开文件阅读了。
效率不高，可以试着保存文件名列表
- 无索引的文件只能先遍历得到索引才好随机。
glob官方函数测试了下10000个文本文件大约耗时0.25s，有点长，不过也还好了。索引之后从0-10000中随机取100个数字就好了。另外得到索引可以保存下来方便下次使用，每次增加文件的时候重新生成索引就好了。 - 可以重命名文件的话把文件按照
1,2,3,4,...10000.txt重命名好直接随机取1-10000中的100个数就好叻。
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