php xpath retrieving attribute-values based on multiple attributes and parent-attributes

Question

I need to select nodes from xml, conditions see below. I am using simplexml, so the xpath has to be 1.0.

XML snippet:

<scales>
    <scale id="1" gender="*" age="*">
        <d scid="hi" raw="10" t="76" />
        <d scid="pn" raw="12" t="80" />
    </scale>
    <scale id="2" gender="m" age="*">
        <d scid="hi" raw="8" t="79" />
        <d scid="pn" raw="2" t="50" />
    </scale>
    <scale id="3" gender="*" age="19-39">
        <d scid="hi" raw="0" t="48" />
        <d scid="pn" raw="10" t="49" />
    </scale>
</scales>

Now, I want to select the t-Attribute of a <d> node that has...

 raw="10" AND scid="hi"

 $result=$xml->xpath('//d[@scid="hi"][@raw="10"]/@t');

And its parent-node <scale> has...

(gender="*" OR gender="m") AND (age="*" OR age="39-59")

$result=$xml->xpath('//scale[@gender="*" or @gender="m"][@age="*" or @age="39-59"]');

I'd like to get this with 1 xpath-statement from my simplexml-object $xml.

There's an error in your XML at least raw="12 is missing a " which may not be hleping or is that just a mistype on here ? — Dave
– Dave, Commented Mar 1, 2013 at 13:08
can you provide some actual php code like how you're attempting to query it at the moment — Dave
– Dave, Commented Mar 1, 2013 at 13:23

Passerby · Accepted Answer · 2013-03-03 04:24:26Z

4

Just combine your two XPath query...

Live demo

$str=<<<XML
<scales>
    <scale id="1" gender="*" age="*">
        <d scid="hi" raw="10" t="76" />
        <d scid="pn" raw="12" t="80" />
    </scale>
    <scale id="2" gender="m" age="*">
        <d scid="hi" raw="8" t="79" />
        <d scid="pn" raw="2" t="50" />
    </scale>
    <scale id="3" gender="*" age="19-39">
        <d scid="hi" raw="0" t="48" />
        <d scid="pn" raw="10" t="49" />
    </scale>
</scales>
XML;
$xml=simplexml_load_string($str);
foreach($xml->xpath('//scale[@gender="*" or @gender="m"][@age="*" or @age="39-59"]/d[@scid="hi"][@raw="10"]/@t') as $t)
{
    echo $t;
}

Outputs 76.

answered Mar 3, 2013 at 4:24

Passerby

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Comments

Dave · Accepted Answer · 2013-03-01 13:35:32Z

0

ok quick read into xpath seems like you can do attribute matches something like this

 $path = "(scale[@gender=\"*\"]|scale[@gender=\"m\"]) & (scale[@age=\"*\"]|scale[@age=\"39-59\"])";
 $scale= $xml->xpath($path);

This should return you the actual scale tag you want. Then you can foreach loop through the tags within the returned $scale and pull the standard attributes using something like this (note not accurate but right concept)

foreach($scale->d[0]->attributes() as $a => $b => $c) {
    echo "t=$c\"\n";
}

answered Mar 1, 2013 at 13:35

Dave

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