I want to replace a foreach loop using a xpath expression, but I need that a DOMXPath object to return more than one list.
I have the following XML (simplified) and I using DOMDocument and DOMXPath to iterate over it:
<a:RoomsType>
<a:Rooms>
<a:Room>
<a:RPH>0</a:RPH>
</a:Room>
<a:Room>
<a:RPH>1</a:RPH>
</a:Room>
<a:Room>
<a:RPH>2</a:RPH>
</a:Room>
<a:Room>
<a:RPH>0</a:RPH>
</a:Room>
<a:Rooms>
<a:RoomsType>
I want to split the rooms by the RPH number, creating a list of rooms for each RPH number. Currently, I'm using the following code:
//$xpath is a DOMXPath object
$roomsToIterate = $this->xpath->query("//a:RoomsType/a:Rooms/a:Room");
$roomList = array();
foreach ($roomsToIterate as $room) {
$rphCandidate = $room->getElementsByTagName("RPH")->item(0)->nodeValue;
if (!isset($roomList[$rphCandidate])) {
$roomList[$rphCandidate] = array();
}
$roomList[$rphCandidate][] = $room;
}
This is working for now, but I want to replace the foreach loop with a Xpath expression. I can use the expression $rooms = $this->xpath->query("//a:RoomsType/a:Rooms/a:Room[a:RPH='{$rph}']");
with $rph
being a number, but how can I do it if I don't know the RPH (it could be anything between 0 and 99). Is it possible?
In short, Are there any way to replace my foreach loop using XPath?
I was thinking about the use of registerPhpFunctions and a custom function, but I concerned about the performance of this approach compared with foreach loop