php - XMLWriter Not Found Using PHPWord -

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i'm new php , working on project using phpword. when executing following code :
$this->_xmlwriter = new xmlwriter();
it said:

fatal error: class 'xmlwriter' not found in .../phpword/shared/xmlwriter.php on line 61

i checked php info using php -m , php --rc xmlwriter, found xmlwriter module , class has been loaded.


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