Hi all,
I got a problem with uploading files which encounter the memory limit when their size is not even close to the memory limit itself, let me explain.
My server is as follows: 1. PHP 4.3.9 2. DB - Postgresql 7.4 3. Apache 1.3.26
Here is my code that i made for testing the problem (along the code i echoed the function memory_get_usage() to know how much memory was allocated already for the script):
$imagefile = $_FILES['imagefile']; // recieve the file echo memory_get_usage().'<br />'; // 118592 memory bytes allocated $data = pg_escape_bytea(`cat $imagefile[tmp_name]`); echo memory_get_usage().'<br />'; // 5570280 memory bytes allocated
$data = "INSERT INTO test_files (bin_data, filename, filesize, filetype)
VALUES ('$data', '$imagefile[name]', '$imagefile[size]', '$imagefile[type]')"; // creating the sql for the insert, i called the received value also $data cause i dont want to keep the previous $data (after all we want to save our precious memory no? :))
echo memory_get_usage().'<br />'; // 5570400 memory bytes allocated {changed from b4 only alittle}
if ( !$res = pg_query ($this->conn, $data) ) // try to insert the sql string
return 'error';
else
return 'gr8';
echo memory_get_usage().'<br />'; // 5570648 memory bytes allocated {again changed only alittle}
Now as far as i see the script needed about 5.5MB of memory to upload a file of 4.7MB but thats what so weird here... i receive the memory limit error even if the php.ini "memory_limit" is set to 16MB! {twice of the default of 8MB!} at 32MB it works fine... but thats way too much..
I suspect that the problem is connected to the pg_query function itself but i didnt find what made it exactly...
Do you suspect or that's where the script output ends?
Even between 2nd and 3rd memory_get_usage() call your script's memory usage increased rapidly - first the sql query was created, then it was assigned to $data. So for a moment the file was in memory twice.
Something similar is with pg_query() - the file was at a moment in $data string, then it is copied somewhere in the php_pg module and the memory usage tripples.
As a solution you might want to implement (or look for implementation of) mysql's load_file() function.
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