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2017 © Pedro Peláez
XML parser with a functional approach
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Functional XML-reader for PHP 5.3+., (*4)
A somewhat different approach to reading/parsing XML files with PHP, using a hierarchy of anonymous functions (closures) reflecting the hierarchy of the XML document itself., (*5)
This is useful when reading structured XML documents - e.g. XML documents with a predictable structure. It's probably less than enjoyable when reading unstructured documents, such as XHTML documents., (*6)
Parsing happens on-the-fly, e.g. avoiding the overhead of loading an entire document into memory and performing repetitive queries against it. This approach is memory efficient, enabling you to parse very large documents in a streaming fashion - it is not super fast (throughput ~500 KB/sec on my laptop) but XML parsing is never truly fast, so you should definitely always cache the parsed results., (*7)
Let's say you wish to read the following XML file:, (*8)
<?xml version="1.0" encoding="UTF-8"?>
<cats>
<cat name="whiskers">
<kitten name="mittens"/>
</cat>
<cat name="tinker">
<kitten name="binky"/>
</cat>
</cats>
Your reader might look something like this:, (*9)
$doc = new Parser();
$doc['cats/cat'] = function (Visitor $cat, $name) {
echo "a cat named: {$name}\n";
$cat['kitten'] = function ($name) {
echo "a kitten named: {$name}\n";
};
};
$doc->parseFile('my_cats.xml');
The output would be this:, (*10)
a cat named: whiskers a kitten named: mittens a cat named: tinker a kitten named: binky
If it's not obvious, the path cats/cat designates a <cat> node inside a <cats> node., (*11)
You can also match text-nodes, e.g. a path like foo/bar#text will match YO in <foo><bar>YO</bar></foo>., (*12)
And finally, you can use #end to match closing tags, if needed., (*13)
Incidentally, I don't actually have cats - but if I did, you can bet those would be their names., (*14)
See "test.php" and "example/cd_catalog.php" for more examples of how to use this., (*15)
XML parser with a functional approach
LGPL-3.0+
XML parser with a functional approach
LGPL-3.0+
XML parser with a functional approach
LGPL-3.0+
XML parser with a functional approach
LGPL-3.0+