php的$_FILES的临时储存文件与回收机制实测过程
我想有跟我一样的想法的人会这样处理的: 上传的文件只是想临时使用,不需要把原文件保存备用,如resize之类的操作,且这些后期的操作会出现在第二轮从客户端请求时才操作的,如先上传,把上传的临时文件路径返回到浏览器,用户点击后再对这个临时文件进行操作;可是在实际的实现中发现,这个临时文件在二轮请求时,竟然不存在了,跑到临时文件夹中查看也没有找到.
我在某q群中也遇到有人问过这个问题,导致的原因也是跟我的这个实现想法差不多.所以,就有个疑惑,上传文件是怎么个原理?
不想去看php的实现代码,我大概的想了下,应该是一种回收机制:点击了临时文件空间,那么,php自身应该自己维护这块空间的回收;
于是自己尝试上传了一下极大的文件,大到足够让php运行很长时间,我以为我会看到它出现在临时文件夹中.可惜的是,我竟然没有看到它的身影,直到php返回:因为此文件超过上传限制;然后我使用小文件上传打印出它的临时文件夹路径,发现它是以php开头,以tmp结束的文件命名方式;
我想了个方式,使用while卡住上传php的本次进程一定的时间再返回,这回我看到了临时文件夹中的临时文件,确实是以php**.tmp这样的命名,如图
如果在php运行的过程中使用刷新页面的非正常结束php的方式来中止php解析话,那么这个临时文件就会永久的保留,
如果php是正常的结束话,这个文件会在php的结束时删除.
同时我感觉到这个文件应该是在上传完成后再出现的:从我上传大文件看不到它的身影推断;
所以,php的临时文件维护方式是php一结束就回收资源,想在第二轮请求使用这个文件话,应该自己移动后进行维护此文件,
在本次测试中,并没有测试php include多个嵌套情况时,在什么时机下进行回收的.
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