(PECL solr >= 0.9.2) Resets the internal pointer to the beginning

(PECL solr >= 0.9.2) Sorts the fields in the document

(PECL solr >= 0.9.2) Creates a copy of a SolrDocument object

(PECL solr >= 0.9.2) Drops all the fields in the document

(PECL solr >= 0.9.2) Constructor public S

(PECL solr >= 0.9.2) Removes a field from the document

(PECL solr >= 0.9.2) Returns a SolrInputDocument equivalent of the object

(PECL solr >= 0.9.2) Removes a field from the document

(PECL solr >= 0.9.2) Checks if a field exists in the document

(PECL solr >= 0.9.2) Used for custom serialization