xml - XPath query with PHP -

here's xml code i'm working with:

<inventory>     <drink>         <lemonade supplier="mother" id="1">             <price>$2.50</price>             <amount>20</amount>         </lemonade>         <lemonade supplier="mike" id="4">             <price>$3.00</price>             <amount>20</amount>         </lemonade>         <pop supplier="store" id="2">             <price>$1.50</price>             <amount>10</amount>         </pop>     </drink> </inventory> 

then wrote simple code practice working xpath:

<?php     $xmldoc = new domdocument();     $xmldoc->load('sample.xml');      $xpathvar = new domxpath($xmldoc);      $queryresult = $xpathvar->query('//lemonade/price');     foreach($queryresult $result) {         echo $result->textcontent;     } ?> 

that code working well, outputting lemonade price values expected. when change query string select elements attribute set value,

//lemonade[supplier="mother"]/price

or

//lemonade[id="1"]/price

it won't work, no output @ all. doing wrong?

try this:

//lemonade[@id="1"]/price 

or

//lemonade[@supplier="mother"]/price 

without "@" looks child elements name instead of attributes.