doctrine/dbal — pull request #555 by BenMorel (2014-03-27 22:59:03+00:00)
Title: Improved performance of BlobType

I noticed that the `string` to `resource` conversion code in `BlobType` uses a quite inefficient technique.
This PR improves its performance with a simple change involving the `php://temp` stream.

Quick benchmark of the two approaches, converting a 10MB string:

$value = str_repeat('x', 10 * 1024 * 1024);

$t = microtime(true);
$fp = fopen('data://text/plain;base64,' . base64_encode($value), 'r');
printf("%.3fs\n", microtime(true) - $t);

$t = microtime(true);
$fp = fopen('php://temp', 'rb+');
fwrite($fp, $value);
fseek($fp, 0);
printf("%.3fs\n", microtime(true) - $t);

Results on my laptop:

0.090s
0.008s

A tenfold improvement!