phpQuery::newDocument($html, $contentType = null) Creates new document from markup. If no $contentType, autodetection is made (based on markup). If it fails, text/html in utf-8 is used.
phpQuery::newDocumentFile($file, $contentType = null) Creates new document from file. Works like newDocument()
phpQuery::newDocumentHTML($html, $charset = 'utf-8')
phpQuery::newDocumentXHTML($html, $charset = 'utf-8')
phpQuery::newDocumentXML($html, $charset = 'utf-8')
phpQuery::newDocumentPHP($html, $contentType = null)
phpQuery::newDocumentFileHTML($file, $charset = 'utf-8')
phpQuery::newDocumentFileXHTML($file, $charset = 'utf-8')
phpQuery::newDocumentFileXML($file, $charset = 'utf-8')
phpQuery::newDocumentFilePHP($file, $contentType)

http://blog.csdn.net/aerchi/article/details/23121239