Load XML element by element, to save memory in PHP

I need to read an XML file on a low memory system (don't have access to increase it). I've tried:

$xmlString = file_get_contents($file);
$doc= new DOMDocument();
$doc->loadXML($xmlString);

and

$doc= new DOMDocument();
$doc->load($file);

Both give me memory errors.

Was wondering if there is a way to read the XML sequentially node by node, so only 1 node is in memory at any given time. I don't care how long this takes as it's a nightly batch process.

The 开发者_运维知识库structure of the XML is very simple:

        <InventoryItem>
        <SKU>125244</SKU>
        <Quantity>137196</Quantity>
        <Status>Active</Status>
        </InventoryItem>

repeated may times.

Maybe treating it as text?

Much thanks

You need a pull parser like XMLReader.

You want to use SAX parsing (using the PHP functions, or XMLReader, as mentioned in another answer).