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Editorial Team
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Asked: 2026-05-12T06:32:01+00:00

What is the cost of parsing a large XML file using PHP on every

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What is the cost of parsing a large XML file using PHP on every page request?

I would like to implement custom tags in HTML.

<?xml version="1.0"?>
<html>
    <head>
        <title>The Title</title>
    </head>
    <body>
        <textbox name="txtUsername" />
    </body>
</html>

After I load this XML file in PHP, I search for the custom tags using XPath and manipulate or replace them.

Is this very costly or is it acceptable?
What about applying this to a large scale web site?

In the past I also used XSLT for large sites, and it didn’t seem to slow things down. This is somehow similar to XSLT, but manual.

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1 Answer

  1. Editorial Team

    Parsing the xml should be fast, as long as you use builtin functions like DOMXPath and your xml files are not too large.

    However, I would rather replace the custom tags with function-calls and include the file in php, which should be a lot faster, since you’re not doing any string manipulation in PHP then:

    <?xml version="1.0"?>
<html>
    <head>
        <title>The Title</title>
    </head>
    <body>
        <?php textbox('txtUsername') ?>
    </body>
</html>
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