Getting information from more than one large XML file - php

Question

I am trying to get information from external large xml files; from file 1 (vehicleList.xml) and file 2 (CheckVehicles.xml) into a PHP file. All values in XML file 2 are in XML file 1. I would like to display only values in file 1 that are in XML file 2.
My foreach loop code can bring results for up to 130 items (that is if I reduce the items in XML file 2 to 130 items/nodes). However if I remove the if statement, I am able to get all the 3340 items/vehicles from XML file 1.
Where am I going wrong? I tried arrays but failed.
Here is my code:
//XML FILE 1 with 1300 items
$myXML = new SimpleXMLElement('CheckVehicles.xml', NULL, TRUE);//
foreach($myXML->root->item as $item){
$listArrayNew[(int)$item->value] = (int)$item->value;
}
//XML FILE 2 with 3340 vehicles
$parser = new SimpleXMLElement('vehicleList.xml', NULL, TRUE);
foreach ($parser->GetVehiclesListResponse->GetVehiclesListResult->Vehicle as $Vehicle) {
if($listArrayNew[(int)$Vehicle->ID] == (int)$Vehicle->ID){
$vehicle = $Vehicle->Description;
$regNumber = $Vehicle->RegistrationNumber;
$siteID = $Vehicle->SiteID;
$row .= "<tr>
<td>".$vehicle."</td>
<td>".$regNumber."</td>
<td>".$siteId."</td>
</tr>";
}
}
Here are the XML files:
XML file 1: vehicleList.xml
<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope>
<GetVehiclesListResponse>
<GetVehiclesListResult>
<Vehicle>
<ID>153</ID>
<SiteID>11</SiteID>
<GroupID>3</GroupID>
<Description>A.O Basid KAR 459 E</Description>
<RegistrationNumber>KAR 459 E</RegistrationNumber>
</Vehicle>
..............................
<Vehicle>
<ID>3340</ID>
<SiteID>25</SiteID>
<GroupID>4</GroupID>
<Description>UAR 712B White Nissan Tiida (Deus Mubangizi)</Description>
<RegistrationNumber>UAR 712B</RegistrationNumber>
</Vehicle>
</GetVehiclesListResult>
</GetVehiclesListResponse>
</soap:Envelope>
XML file 2: CheckVehicles.xml
<?xml version="1.0" encoding="utf-8"?>
<Result>
<root>
<item>
<index>0</index>
<value>153</value>
</item>
...................
<item>
<index>1300</index>
<value>128</value>
</item>
</root>
</Result>

Answer 1

I don't know where you go wrong in your case. However if you want to select elements from the second file based on a criteria (e.g. an ID / unique Number) from the first file I suggest you make use of xpath in your case:
Obtain the numbers from the first file that are the criteria (e.g. /*/root/item/value)
Select all elements from the second file that match the criteria (e.g. ID in /*/GetVehiclesListResponse/GetVehiclesListResult/Vehicle).
The later point can best be achieved by using the technique outlined in Is there anything for XPATH like SQL “IN”? which is creating a comma separated list of the numbers to select and then compare this against each elements number.
Example:
Consider there 2 500 out of 10 000 elements in a first file and in a second file there are 10 000 elements. Each element can be uniquely identified by it's ID.
The first file has this layout:
<?xml version="1.0"?>
<root>
<item>
<index>0</index>
<id>604</id>
</item>
<item>
<index>1</index>
<id>2753</id>
</item>
...
</root>
And the second file has this layout.
<?xml version="1.0"?>
<list>
<item>
<id>1</id>
<some>Number: 33</some>
</item>
<item>
<id>2</id>
<some>Number: 35</some>
</item>
...
</list>
The xpath query to get all IDs from the first file therefore is:
//item/id
And the query for the second file can be expressed with SimpleXML in PHP as:
$ids = implode(',', $file1->xpath('//item/id'));
$query = '//item[contains(",' . $ids . ',", concat(",", id, ","))]';
You can find example code of that example here: http://eval.in/6370