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Hello,

We recommend you check and run the samples available in the package and the API documentation pages. And also read the available documentation.

For example, from the mergeDocx API documentation (https://www.phpdocx.com/api-documentation/docxutilities/merge-Word-documents-with-PHP). The signature of the method:

public mergeDocx (string $firstDocument, array $documentArray, string $finalDocument, array $options) 

A sample using it:

$merge = new MultiMerge();

$merge->mergeDocx('document.docx', array('second.docx', 'other.docx'), 'output.docx', array());

The mergeDocx method generates the output.docx file with DOCX merged. Please checn and run the samples included in the package.

In your code, you are merging DOCX documents:

$mergeResult = $merge->mergeDocx($INPUT_DIRECTORY . $INPUT_FILE1, array($INPUT_DIRECTORY . $INPUT_FILE2,$INPUT_DIRECTORY . $INPUT_FILE3), $OUTPUT_DIRECTORY . $OUTPUT_FILE, array('mergeType' => 1));

and then you are saving a DOCX with the same file name, so your code overwrites the file generated with mergeDocx:

$output_file_path = $OUTPUT_DIRECTORY . $OUTPUT_FILE;
$docx->createDocx($output_file_path);

As your code hasn't added any content to $docx, an empty document is created.

We also recommend you debug if your code can read and generate all needed files. If you send to contact[at]phpdocx.com the files you are merging we'll test them using mergeDocx.

Regards.