Description:
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To allow extending pecl/solr classes and allow mocking them with PHPUnit it would be required to remove the final keyword. Attached is a patch which does that for the current trunk version, but should also apply for 0.9.11.

Reproduce code:
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class MockedSolrClient extends SolrClient{}
$client = new MockedSolrClient(array('hostname' => 'localhost'));
var_dump($client);

Expected result:
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object(MockedSolrClient)#1 (1) {
  ["_hashtable_index":"SolrClient":private]=>
  int(16995)
}


Actual result:
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Fatal error: Class MockedSolrClient may not inherit from final class (SolrClient) in Command line code on line 2