- var_dump: documentation ( source)
<?php
$xml = <<<'XML'
<row>
<rowid>1</rowid>
<currencysymbol>€</currencysymbol>
<totalrecords>2145</totalrecords>
<affcustomid>11159_4498302</affcustomid>
<period>7/1/2014</period>
<impressions>0</impressions>
<clicks>1</clicks>
<clickthroughratio>0</clickthroughratio>
<downloads>1</downloads>
<downloadratio>1</downloadratio>
<newaccountratio>1</newaccountratio>
<newdepositingacc>1</newdepositingacc>
<newaccounts>1</newaccounts>
<firstdepositcount>1</firstdepositcount>
<activeaccounts>1</activeaccounts>
<activedays>1</activedays>
<newpurchases>12.4948</newpurchases>
<purchaccountcount>1</purchaccountcount>
<wageraccountcount>1</wageraccountcount>
<avgactivedays>1</avgactivedays>
<netrevenueplayer>11.8701</netrevenueplayer>
<Deposits>12.4948</Deposits>
<Bonus>0</Bonus>
<NetRevenue>11.8701</NetRevenue>
<TotalBetsHands>4</TotalBetsHands>
<Product1Bets>4</Product1Bets>
<Product1NetRevenue>11.8701</Product1NetRevenue>
<Product1Commission>30</Product1Commission>
<Commission>0</Commission>
<CPACommission>30</CPACommission>
</row>
XML;
$dom = new DOMDocument();
$dom->loadXml($xml);
$xpath = new DOMXpath($dom);
var_dump(
$xpath->evaluate('string(//row[CPACommission > 0]/affcustomid)')
);