When using the readfile_chunked function noted here with files larger than 10MB or so I am still having memory errors. You can modify this and add fpassthru instead of fread and while, but it sends all data from begin - it would be not fruitful if request is bytes from 100 to 200 from 100mb file. It can be slow for big files to read by fread, but this is a single way to read file in strict bounds.
Send file with HTTPRange support (partial download):
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You can read comments in the code itself for more details and raise issues for the library, if you think something is incorrect there (especially since it's WIP at the moment of writing this), but so far I am able to get consistent behavior with it. That is why in my library I use a helper function ("speedLimit") to calculate whether selected speed limit will fit the available memory (while allowing some headroom). It does not mean that you can fully escape memory exhaustion, though: if you are reading too much at a time, you can still encounter it. At least, when I was testing "download" function for my library on 1.5G file with 256M memory limitation that was the case: "fread" I got peak memory usage of ~240M, while with "stream_copy_to_stream" - ~150M. Meanwhile "stream_copy_to_stream" seems to utilize the same amount of memory as "readfile".
It does work, but you may encounter memory exhaustion using "fread".
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