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From: "J.O. Aho" <user@example.net>
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Subject: Re: Downloading strangeness: downloaded file has no content
Date: Sun, 2 Oct 2022 12:14:13 +0200
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On 01/10/2022 21.44, Tim Streater wrote:

>>> ob_clean ();

This will just clean out the output buffer, so the max size would then 
be limited of the buffer size, think you need to switch to use 
ob_end_clean() which disables the output buffer and is recommended in 
the php documentation for readfile.


>>> readfile ($file);

By the way, what value does the redfile return?
Also do you get an exception?
Could also be got to check the file exists and can be read

If(file_exists($file))  is_file($file))
{
	if(is_file($file)) {
		if(is_readable($file)) {
			try {
				$retval =  readfile ($file);
				// log the retval to your logfile
			} catch (Exception $ex) {
				//log the exception here
			}
		} else {
			// log that file not readable
		}
	} else {
		// log file not really a file, most likely a directory
	}
} else {
	// log the file do not exists
}


-- 

  //Aho