PHP function to compare equality of XML elements - php

Question

I have an XML file which is supposed to be my phones contacts backup and I am trying to create a php file to retrieve only the contacts that have a phone number assigned to them. The file contains contacts from different applications.
The XML has these elements:
<Contact>
<Id>5238</Id>
<GivenName>friend1</GivenName>
<FullName>friendA</FullName>
<CreateTime>0001-01-01T00:00:00+00:00</CreateTime>
<ModifyTime>0001-01-01T00:00:00+00:00</ModifyTime>
<Starred>false</Starred>
<AccountName>SIM</AccountName>
<AccountType>com.anddroid.contacts.sim</AccountType>
</Contact>
<PhoneNumbers>
<Id>53</Id>
<ContactId>1380</ContactId>
<Name>2</Name>
<Value>07123456789</Value>
<Primary>2</Primary>
</PhoneNumbers>
<Contact>
<Id>328</Id>
<FamilyName>tee</FamilyName>
<GivenName>friend2</GivenName>
<FullName>friend2 tee</FullName>
<CreateTime>0001-01-01T00:00:00+00:00</CreateTime>
<ModifyTime>0001-01-01T00:00:00+00:00</ModifyTime>
<Picture>18948</Picture>
<Starred>false</Starred>
<AccountName>xxxxxxx#hotmail.com</AccountName>
<AccountType>com.htc.socialnetwork.facebook</AccountType>
</Contact>
And I want to make a php file that will retrieve the FullName from Contact and the Value from PhoneNumbers where the Contact/Id matches the PhoneNumbers/ContactId.
I created this code:
<?php
$xml = simplexml_load_file("Contact.xml");
$i=0;
$k=0;
foreach ($xml->Contact as $contact) {
if ($contact->AccountName == "SIM"){
echo "Contact: " . $k . "<br /> "; echo $contact->nodeValue[$k] . "<br /> " . $contact->FullName . "<br /> ";
$k++;
}
}
foreach ($xml->PhoneNumbers as $number) {
echo "Contact: " . $i . "<br /> "; echo $number->Value . "<br /> ";
$i++;
}
?>
It outputs 53 contacts and 173 numbers. If I dont put the if ($contact->AccountName == "SIM") it outputs the same numbers but 700++ contacts. I just want some help producing a function or something to output only the contacts that I already have their phone number.
Any help is appreciated.
Thank you

Answer 1

I would suggest to use a XSL-stylesheet:
<xsl:stylesheet version="1.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform" >
<xsl:template match="/">
<ul><xsl:apply-templates/></ul>
</xsl:template>
<xsl:template match="Contact">
<!-- select phonenumbers with the matching ContactId -->
<xsl:variable name="numbers" select="//PhoneNumbers[ContactId=current()/Id]"/>
<!-- when any matching PhoneNumber has been found, continue -->
<xsl:if test="count($numbers) > 0">
<li>
<xsl:value-of select="FullName"/>
<ul>
<!-- call a named template with the matching PhoneNumbers as param -->
<xsl:call-template name="printNumbers">
<xsl:with-param name="numbers" select="$numbers" />
</xsl:call-template>
</ul>
</li>
</xsl:if>
</xsl:template>
<xsl:template name="printNumbers">
<xsl:param name="numbers" />
<!-- loop through PhoneNumbers and print the Value -->
<xsl:for-each select="$numbers">
<li><xsl:value-of select="Value" /></li>
</xsl:for-each>
</xsl:template>
<xsl:template match="PhoneNumbers"/>
</xsl:stylesheet>
How to use the stylesheet:
<?php
$doc = new DOMDocument();
$xsl = new XSLTProcessor();
$doc->load('path/to/stylesheet.xsl');
$xsl->importStyleSheet($doc);
$doc->load('Contact.xml');
echo $xsl->transformToXML($doc);
?>