PHP Foreach save ID - php

Question

I have so called "GAEB" files, which are in XML structure.
I loop through these via foreach and simplexml.
XML/GAEB File:
<GAEB>
<Award>
<BoQ>
<BoQBody>
<BoQCtgy RNoPart="01">
<BoQBody>
<BoQCtgy RNoPart="01">
<BoQBody>
<BoQCtgy>
<BoQBody RNoPart="01">
<Itemlist>
<Item RNoPart="1">
<Item RNoPart="2">
</Itemlist>
</BoQBody>
</BoQCtgy>
<BoQCtgy>
<BoQBody RNoPart="02">
<Itemlist>
<Item RNoPart="1">
<Item RNoPart="2">
</Itemlist>
</BoQBody>
</BoQCtgy>
</BoQBody>
</BoQCtgy>
<BoQCtgy RNoPart="02">
<BoQBody>
<BoQCtgy>
<BoQBody RNoPart="01">
<Itemlist>
<Item RNoPart="1">
<Item RNoPart="2">
</Itemlist>
</BoQBody>
</BoQCtgy>
<BoQCtgy>
<BoQBody RNoPart="02">
<Itemlist>
<Item RNoPart="1">
<Item RNoPart="2">
</Itemlist>
</BoQBody>
</BoQCtgy>
</BoQBody>
</BoQCtgy>
</BoQBody>
</BoQCtgy>
</BoQBody>
</BoQ>
</Award>
</GAEB>
My PHP Code Loops through all $xml->BoQBody->BoQCtgy till it finds a Itemlist.
Then looping through that Itemlist and get some informations from there.
After that start loop again.
PHP:
<?php
$file = "pathtoxmlfile";
$xml = simplexml_load_file($file);
function loop($path, $xml){
foreach($path->BoQBody->BoQCtgy as $BoQCtgy){
$nr = $BoQCtgy->attributes()["RNoPart"];
echo $nr;
if(ISSET($BoQCtgy->BoQBody->Itemlist) === TRUE{
foreach($BoQCtgy->BoQBody->Itemlist->Item as $item){
$pos = $item->attributes()["RNoPart"];
echo $pos;
}
}
}
loop($BoQCtgy,$xml);
}
loop($xml->Award->BoQ,$xml);
?>
How I get a clear numbering of all my positions?
The above example should be:
01
01.01
01.01.01
01.01.01.1
01.01.01.2
01.01.02
01.01.02.1
01.01.02.2
The problem is, the deepth is everytime a other.
I get all positions and all values I need with the PHP Code without any problems.
But I can't get a matching numbering...
Hope somebody knows a solution.

Answer 1

Using XPath you don't have to worry about what depth items are at. In this case it first looks for any node with an RNoPart attribute using //*[#RNoPart]...
// - any level
any node
[#RNoPart] - with a RNoPart attribute (the # indicates an attribute)
It loops over the results and then uses the ancestor axes in XPath to look for all parent elements with another RNoPart attribute, using ancestor::*/#RNoPart.
As it loops over these (in this example) it just outputs the values followed by a . and a new line after each sub set.
So put together, you get...
foreach ( $xml->xpath("//*[#RNoPart]") as $part ) {
foreach ( $part['RNoPart']->xpath("ancestor::*/#RNoPart") as $part ) {
echo $part.".";
}
echo PHP_EOL;
}
and with your sample XML, outputs...
01.
01.01.
01.01.01.
01.01.01.1.
01.01.01.2.
01.01.02.
01.01.02.1.
01.01.02.2.
01.02.
01.02.01.
01.02.01.1.
01.02.01.2.
01.02.02.
01.02.02.1.
01.02.02.2.