(PECL solr >= 0.9.2)
  	
    
      
      Returns a SolrInputDocument equivalent of the object
    
    
      
      public SolrInputDocument SolrDocument::getInputDocument ( void )
    
    
    
    Returns a SolrInputDocument equivalent of the object. This is useful if one wishes to resubmit/update a document retrieved from a query.
Returns: 
     Returns a SolrInputDocument on success and NULL on failure. 
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