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Asked: 2026-05-12T08:34:16+00:00

I’m using PHP+curl to retrieve an XSL file, but first I want to do

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I’m using PHP+curl to retrieve an XSL file, but first I want to do some minimum validation that the file is really a XSL file.

I make sure the file exists, has status code 200 OK, and that it has the correct file extension, but then I want to check the header for the Content-Type. I do this using curl_getinfo() function. All fine.

But XSL files always return “application/xml” or “text/xml” as the Content-Type, which is for XML files. I believe an XSL header should be “application/xslt+xml“. So what’s going on here and how can I make sure it’s an XSL document?

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1 Answer

  1. Editorial Team

    You can check the XSLT namespace in the file.
    If PHP version >= 5.1.2, use SimpleXMLElement::getNamespaces()

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