Best way to process large XML in PHP [duplicate]

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For a large file, you’ll want to use a SAX parser rather than a DOM parser.

With a DOM parser it will read in the whole file and load it into an object tree in memory. With a SAX parser, it will read the file sequentially and call your user-defined callback functions to handle the data (start tags, end tags, CDATA, etc.)

With a SAX parser you’ll need to maintain state yourself (e.g. what tag you are currently in) which makes it a bit more complicated, but for a large file it will be much more efficient memory wise.

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