phpCopy code$zip = new ZipArchive;
$docxFile = 'path/to/original/docx/file.docx';
$zip->open($docxFile);

$documentXml = $zip->getFromName('word/document.xml');

// Find and replace the keyword
$keywordToReplace = 'log';
$replacement = 'dog';
$newDocumentXml = str_replace($keywordToReplace, $replacement, $documentXml);

// Save the modified file as a new DOCX file
$newDocxFile = 'path/to/new/docx/file.docx';
$zip->addFromString('word/document.xml', $newDocumentXml);
$zip->close();
copy($docxFile, $newDocxFile);

Here's how this example works:
First, we create a new instance of the ZipArchive class and open the original DOCX file.
Next, we retrieve the contents of the word/document.xml file from the DOCX file using the ZipArchive::getFromName() method.
We then search for the keyword to replace in the XML content using the str_replace() function.
We create a new DOCX file and add the modified XML content to it using the ZipArchive::addFromString() method.
Finally, we close the original DOCX file and save the new file as a copy of the original file.
Note that this example only demonstrates how to find and replace text in the word/document.xml file. If you need to modify other parts of the document, you will need to modify the corresponding XML files in the DOCX file.