PHP File upload fails with blank screen when size exceeds 742 KB

This is one of the most bizarre errors I've come across. So I've written a little file upload web app for my friend and it works fine for any file less than or equal to 742kB in size. Needless to say, I arrived at this precise number based on relentless testing.

Weird part is that if the file size is just a few KB more, for example 743 or 750, I get an error saying "MySQL has gone away". But if it is 1MB or more, then I just get a blank screen. And it happens in less th开发者_开发百科an 2 seconds after I hit the upload button. So it doesn't look like a time-out to me.

I checked out the PHP.ini file for post size and upload size, they are all set to 5 MB or more. And the timeout is set to 60 seconds.

The uploaded file sits in MySQL database in a field of datatype mediumblob. I tried changing that to longblob. But that didn't help either.

Any help?

Thanks for reading, Girish

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Try increasing max_allowed_packet (defaults to 1 mb) as described in the documentation here.

This link may also be of interest.

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What is the mysql error number you are getting from the query to upload?

PHP Ref: mysql_error

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http://dev.mysql.com/doc/refman/5.0/en/packet-too-large.html