What PHP library or tool can scale the size of an existing PDF and its contents?

I have written an web application that dynamically creates PDFs that contain only 1-page that has various vector graphics in it, say for example a complex pie or bar chart. In the back-end I have need to scale this PDF and its c开发者_如何转开发ontents programaticaly to a few different sizes for print.

The few tools I've looked at so far for PHP seem to generate an image out of the original PDF and scale that, which doesn't work for me, I need the contents to remain vectorized and scale with the document.

Any pointers?

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probably the simples walkaround would be to generate different PDF files for different page sizes from your original web-application