simpleXML get node child based on attribute [duplicate]

Question

I am trying to parse out the value of a node I am referencing by one of its attributes. but I am not sure of the syntax

XML:

<data> <poster name="E-Verify" id="everify"> <full_image url="e-verify-swa-poster.jpg"/> <full_other url=""/> </poster> <poster name="Minimum Wage" id="minwage"> <full_image url="minwage.jpg"/> <full_other url="spa_minwage.jpg"/> </poster> </data>

here is where I want to get the url value of full_image where poster id equal to minwage:

$xml = simplexml_load_file('PosterData.xml'); $main_url = $xml->full_image[name] where poster[id] = "minwage"; //something like that. echo $main_url; Result: minwage.jpg

If anyone has any resources that cover this stuff please share.

As you asked for resources, yes there is: Implementing condition in XPath and SimpleXML get element content based on attribute value — hakre
– hakre, Commented Jul 8, 2013 at 19:44

Martin Schneider · Accepted Answer · 2017-03-19 11:34:28Z

30

You should be able to use SimpleXMLElement::xpath() to run an xpath query on a simple XML document.

$xml = simplexml_load_file('PosterData.xml'); $main_url = $xml->xpath('name[@id="minwage"]/full_image')[0]; echo $main_url;

edited Mar 19, 2017 at 11:34

Martin Schneider

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answered Mar 14, 2012 at 6:20

kingcoyote

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4 Comments

Denoteone Over a year ago

This is how I was trying originally. thanks for the info.

Select0r Over a year ago

This is a lot more elegant than just looping and should be the excepted answer.

buck1112 Over a year ago

I've been trying to make this code work, by duplicating the code on my localhost, yet I get "Undefined Offset: 0" Please see: stackoverflow.com/questions/48154956/…

Jordan Over a year ago

Shouldn't "name" in 'name[@id="minwage"]' be "poster"? Since the element is a "poster" element?

Werner · Accepted Answer · 2012-03-14 05:57:06Z

Simply loop the poster elements and remember to cast the attribute values to strings, since you want to compare them (and probably output them) as strings:

$xml = simplexml_load_file('PosterData.xml'); foreach ($xml->poster as $poster) { if ((string) $poster['id'] == 'minwage') { echo (string) $poster->full_image['url']; } }

That worked like a charm. I was def over thinking the process. +1

Sven · Accepted Answer · 2015-11-24 15:43:52Z

You can use:

$object = simplexml_load_string('<data><poster name="E-Verify" id="everify"><full_image url="e-verify-swa-poster.jpg"/><full_other url=""/></poster><poster name="Minimum Wage" id="minwage"><full_image url="minwage.jpg"/><full_other url="spa_minwage.jpg"/></poster></data>'); foreach ($object as $value) { echo "URL: ".$value->full_image->attributes(); echo "<br>"; }

Either use simplexml_load_file('Some external file.xml') if calling external file.

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