fopen/fclose on cache files

[Sahadar]

I had a problem with not closing just opened file in cache directory. Just before line

'file_put_contents($cachedir.DS.$cachefile, $output);' the "$cache_lock" wasn't closed properly.

In case of this i had to work not with file_put_contents method but:

fwrite($cache_lock,$output);
fclose($cache_lock);

Plz sbd check it out if I'm right. Now i got problem fixed by this thing