About apache2.x+php5.2x Large file upload memory footprint

Ask a question, there is information on the Internet that PHP upload large files, files will always be cached in memory, not like ASP. NET will have a threshold, more than that will be written on the disk.

But when I actually do it, I use swfupload or traditional uploads, and I don't see any noticeable rise in the machine's memory.
Did php5 make this improvement? Or what is the reason?
Sincere advice

Reply to discussion (solution)

I'm dizzy, what's going on here,

Move_uploaded_file ($file [' Tmp_name '], $new _file)
Name the temporary file that is uploaded to the server under the specified directory.

That's what happened after the temp file was created ...
When this temporary file is generated, it is put in memory first, then write once, or fragment write, I do not know.

To put it bluntly, is to upload 1g of files, will occupy 1g of memory?

From what I have tested here, it will not take up so much, but before the article on the internet said it will, so in order to ensure the accuracy of this information, or to ask

You can upload large files, through the task manager, to see the memory changes (such as import files).

Frankly, I haven't found a satisfactory answer, the solution you provided, and I've tried it when I'm posting.
But my personal resources are limited, and there is no way to reach any of the platforms of any version of the test.
This kind of test is not rigorous.

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