png.php

<?php

require_once("vendor/autoload.php");

$op = $_REQUEST['op'];

if ($op == "create") {
    png();
} else if($op == "download") {
    word();
}

function png()
{
    $data = $_POST['image_data'];

    if (preg_match('/^data:image\/(\w+);base64,/', $data, $type)) {
        $data = substr($data, strpos($data, ',') + 1);
        $type = strtolower($type[1]); // jpg, png, gif

        if (!in_array($type, ['jpg', 'jpeg', 'gif', 'png'])) {
            die('invalid image type');
        }

        $data = base64_decode($data);

        if ($data === false) {
            die('base64_decode failed');
        }
    } else {
        die('did not match data URI with image data');
    }

    file_put_contents("pic.{$type}", $data);
    echo "OK";
}

function word()
{

    $phpWord = new \PhpOffice\PhpWord\PhpWord();
    $section = $phpWord->addSection();

    $image_path = realpath("pic.png");

    $section->addImage($image_path, array(
        'height' => 100,
        'positioning' => 'absolute',
        'posHorizontal' => \PhpOffice\PhpWord\Style\Image::POSITION_HORIZONTAL_CENTER,
        'posHorizontalRel' => 'margin',
        'posVerticalRel' => 'line',
    ));

    $filename = "test.docx";

    $objWriter = \PhpOffice\PhpWord\IOFactory::createWriter($phpWord, 'Word2007');
    try {

        header("Content-Disposition: attachment; filename='" . $filename . "'");
        $objWriter->save("php://output");

    } catch (Exception $e) {
        die($e->getMessage());
    }
}

?>