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

(PECL solr >= 0.9.2) Retrieves the current field

(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) Returns an array representation of the document

(PECL solr >= 0.9.2) Adds another field to the document

(PECL solr >= 0.9.2) Moves the internal pointer to the next field

(PECL solr >= 0.9.2) Custom serialization of SolrDocument objects

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

(PECL solr >= 0.9.2) Checks if a particular field exists