Select item by attribute using simplexml

Question

I want to select only specified warehouse to update stock. I.E. I want only 99, but every item has different number of warehouses so the code below only works in 99 warehouse in in 3 row:

$quantity_calc = $this_product->stock[2];

Here's sample xml:

<product sku="123546" supplier="BOSCH" price="1.71"> <stock warehouse="SAND">2.00</stock> <stock warehouse="44">2.00</stock> <stock warehouse="55">4.00</stock> <stock warehouse="77">2.00</stock> <stock warehouse="88">2.00</stock> <stock warehouse="97">2.00</stock> <stock warehouse="99">2.00</stock> <stock warehouse="33">2.00</stock> </product>

and print_r($this_product->stock);

[@attributes] => Array ( [warehouse] => SAND ) [0] => 2.00 [1] => 2.00 [2] => 4.00 [3] => 2.00 [4] => 2.00 [5] => 2.00 [6] => 2.00 [7] => 2.00 )

What you really want ? selecting the stock element where warehouse="99" ? — A l w a y s S u n n y
– A l w a y s S u n n y, Commented Aug 1, 2017 at 16:27

ThW · Accepted Answer · 2017-08-01 16:46:57Z

To fetch a part of an DOM use Xpath expressions. SimpleXMLElement::xpath() provides access to it:

$product = new SimpleXMLElement($xml); var_dump( (string)$product->xpath('//stock[@warehouse=99]')[0] );

The DOM extension itself has the DOMXpath class for it:

$document = new DOMDocument(); $document->loadXml($xml); $xpath = new DOMXpath($document); var_dump( $xpath->evaluate('string(//stock[@warehouse=99])') );

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