simpleXML and the same child

Question

I have a dummy xml like this:

<SOA> <cities> <area>Area1</area> <period>period1</period> <center>center1</center> </cities> <cities> <area>Area1</area> <period>period1</period> <center>center2</center> </cities> <cities> <area>Area2</area> <period>period1</period> <center>center3</center> </cities> </SOA>

I want to loop through the xml, my question is: How can I loop trough repeated child? e.g loop through area that area name is Area1 ? (there is 2 Area1 with center1 and center2, I want make a query like this : find all center that area is Area1) Thanks in advance

Maybe it's just me but I don't get the question. What do you want to achieve? — VolkerK
– VolkerK, Commented Aug 5, 2010 at 11:29
I don't see the problem. This is valid XML so why shouldn't it work? — Gaim
– Gaim, Commented Aug 5, 2010 at 11:33
Do you want loop through all children or only through repeated? — Gaim
– Gaim, Commented Aug 5, 2010 at 11:39
there is 2 Area1 with center1 and center2, I want make a query like this : find all center that area is Area1 — TheNone
– TheNone, Commented Aug 5, 2010 at 11:39
The soluion is XPath Query: //cities[area=='Area1'] This XPath returns all cities which has tag area equal to Areal1. Is it alright? — Gaim
– Gaim, Commented Aug 5, 2010 at 11:43

VolkerK · Accepted Answer · 2010-08-05 11:39:43Z

<crystal ball> Maybe you want to iterate over all cities elements that have a area element with the text content Area1 </crystal ball>
You can use XPath for that, e.g.

<?php $soa = getDoc(); foreach( $soa->xpath('cities[area="Area1"]') as $ci ) { foreach( $ci->children() as $child ) { echo $child->getName(), ': ', (string)$child, "\n"; } } function getDoc() { return new SimpleXMLElement('<SOA> <cities> <area>Area1</area> <period>period1</period> <center>center1</center> </cities> <cities> <area>Area1</area> <period>period1</period> <center>center2</center> </cities> <cities> <area>Area2</area> <period>period1</period> <center>center3</center> </cities> </SOA>'); }

prints

area: Area1 period: period1 center: center1 area: Area1 period: period1 center: center2

Thank you! Finally an example I can pick up and understand piecemeal. :)

Tomasz Struczyński · Accepted Answer · 2010-08-05 11:42:53Z

Yes of course. Read for example php XPath manual

http://php.net/manual/en/simplexmlelement.xpath.php

$xml = new SimpleXMLElement($yourXML); $result = $xml->xpath('/SOA/cities/SOA/cities[area="Area1"]'); while(list( , $node) = each($result)) { //$node is a city node with Area1 area }

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