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Hello,

The recommended method to merge docx is the MultiMerge class:

http://www.phpdocx.com/api-documentation/docxutilities/merge-Word-documents-with-PHP

The addExternalMethod uses altChunk tags and doesn't preserve most of the styles of the document.

Please try this code:

require_once 'classes/MultiMerge.inc';
$merge = new MultiMerge();
$merge->mergeDocx(
    'file1.docx', 
    array('file2.docx'), 
    'output.docx', 
    array(
        'mergeType' => 0,
        'numbering' => 'restart',
        'forceLatestStyles' => true,
    )
);

If you still have issues please send to contact[at]phpdocx.com the documents you're trying to merge to check them.

Regards.