PHP readfile() and large files

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You may still have PHP output buffering active while performing the readfile(). Check that with:

if (ob_get_level()) ob_end_clean();

or

while (ob_get_level()) ob_end_clean();

This way theonly remaining output Buffer should be apache’s Output Buffer, see SendBufferSize for apache tweaks.

EDIT

You can also have a look at mod_xsendfile (an SO post on such usage, PHP + apache + x-sendfile), so that you simply tell the web server you have done the security check and that now he can deliver the file.

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