Pecl solr patched for Solr 4.0
Without the patch this error is returned: ERROR: "SolrClientException" with message "Unsuccessful update request. Response Code 400.
<lst name="responseHeader">
<int name="status">400</int>
<int name="QTime">4</int>
</lst>
<lst name="error">
<str name="msg">Unknown commit parameter 'waitFlush'</str>
<int name="code">400</int>
</lst>
</response>