PHPでPDFをSVGに変換する

<?php
require_once("http://localhost:8080/JavaBridge/java/Java.inc");
require_once("lib/aspose.slides.php");
 
use aspose\slides\Presentation;
use aspose\slides\SaveFormat;
 
$pres = new Presentation();
try
{
    $pres->getSlides()->removeAt(0);
    $pres->getSlides()->addFromPdf("document.pdf");
    for ($i = 0; $i < java_values($pres->getSlides()->size()); $i++)
    {
        $slide = $pres->getSlides()->get_Item($i);
        $javafos = new Java("java.io.FileOutputStream", "slide_". $i .".svg");
        $slide->writeAsSvg($javafos);
    }
}
finally
{
    if ($pres != null) $pres->dispose();
}
?>