Reduce memory usage with fclose()

[categoryshell]

When indexing multiple files, for example within a for loop, there is excessive memory usage which could cause PHP to run into memory issues.

By adding fclose() on the file resource, after performing the cURL request, memory usage can be decreased a lot.

On 10 iterations with the file samples/sample5.pdf Without fclose():

Iteration 0
960M
Iteration 1
960M
Iteration 2
960M
Iteration 3
960M
Iteration 4
960M
Iteration 5
960M
Iteration 6
960M
Iteration 7
960M
Iteration 8
960M
Iteration 9
960M
Iteration 10
960M

And after adding fclose():

Iteration 0
192M
Iteration 1
192M
Iteration 2
192M
Iteration 3
192M
Iteration 4
192M
Iteration 5
192M
Iteration 6
192M
Iteration 7
192M
Iteration 8
192M
Iteration 9
192M
Iteration 10
192M```

[vaites]

You're right @JBleijenberg, a fclose() must be added. Will make some tests and merge for the next release.