How to Extract Text from Word and Other Office Files in PHP

Retrieving text from Microsoft Office documents, including Word (.doc and .docx), Excel (.xlsx), and PowerPoint (.pptx), is often necessary for tasks such as searching within document content.

Reading Word Documents

For .doc files, a binary file approach can be used:

class DocxConversion{
    // ...
    private function read_doc() {
        $fileHandle = fopen($this->filename, "r");
        $line = @fread($fileHandle, filesize($this->filename));   
        $lines = explode(chr(0x0D),$line);
        $outtext = "";
        foreach($lines as $thisline)
          {
            $pos = strpos($thisline, chr(0x00));
            if (($pos !== FALSE)||(strlen($thisline)==0))
              {
              } else {
                $outtext .= $thisline." ";
              }
          }
         $outtext = preg_replace("/[^a-zA-Z0-9\s\,\.\-\n\r\t@\/\_\(\)]/","",$outtext);
        return $outtext;
    }
    // ...
}

For .docx files, which are essentially zip files containing XML, you'll need to:

class DocxConversion{
    // ...
    private function read_docx(){
        $striped_content = '';
        $content = '';
        $zip = zip_open($this->filename);
        if (!$zip || is_numeric($zip)) return false;
        while ($zip_entry = zip_read($zip)) {
            if (zip_entry_open($zip, $zip_entry) == FALSE) continue;
            if (zip_entry_name($zip_entry) != "word/document.xml") continue;
            $content .= zip_entry_read($zip_entry, zip_entry_filesize($zip_entry));
            zip_entry_close($zip_entry);
        }// end while
        zip_close($zip);
        $content = str_replace('</w:r></w:p></w:tc><w:tc>', " ", $content);
        $content = str_replace('</w:r></w:p>', "\r\n", $content);
        $striped_content = strip_tags($content);
        return $striped_content;
    }
    // ...
}

Reading Excel Files

This can be done by extracting text from the "xl/sharedStrings.xml" file within the Excel file:

class DocxConversion{
    // ...
    function xlsx_to_text($input_file){
        $xml_filename = "xl/sharedStrings.xml"; //content file name
        $zip_handle = new ZipArchive;
        $output_text = "";
        if(true === $zip_handle->open($input_file)){
            if(($xml_index = $zip_handle->locateName($xml_filename)) !== false){
                $xml_datas = $zip_handle->getFromIndex($xml_index);
                $xml_handle = DOMDocument::loadXML($xml_datas, LIBXML_NOENT | LIBXML_XINCLUDE | LIBXML_NOERROR | LIBXML_NOWARNING);
                $output_text = strip_tags($xml_handle->saveXML());
            }else{
                $output_text .="";
            }
            $zip_handle->close();
        }else{
        $output_text .="";
        }
        return $output_text;
    }
    // ...
}

Reading PowerPoint Files

To extract text from a PowerPoint presentation, open each slide (.xml) file within the zip container:

class DocxConversion{
    // ...
    function pptx_to_text($input_file){
        $zip_handle = new ZipArchive;
        $output_text = "";
        if(true === $zip_handle->open($input_file)){
            $slide_number = 1; //loop through slide files
            while(($xml_index = $zip_handle->locateName("ppt/slides/slide".$slide_number.".xml")) !== false){
                $xml_datas = $zip_handle->getFromIndex($xml_index);
                $xml_handle = DOMDocument::loadXML($xml_datas, LIBXML_NOENT | LIBXML_XINCLUDE | LIBXML_NOERROR | LIBXML_NOWARNING);
                $output_text .= strip_tags($xml_handle->saveXML());
                $slide_number++;
            }
            if($slide_number == 1){
                $output_text .="";
            }
            $zip_handle->close();
        }else{
        $output_text .="";
        }
        return $output_text;
    }
    // ...
}

Usage

To use this class for file conversion, instantiate it with the file path and call the convertToText() method:

$docObj = new DocxConversion("test.doc");
//$docObj = new DocxConversion("test.docx");
//$docObj = new DocxConversion("test.xlsx");
//$docObj = new DocxConversion("test.pptx");
echo $docText= $docObj->convertToText();

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