<?php
        // create curl resource
        $ch = curl_init();

        // set url
        curl_setopt($ch, CURLOPT_URL, "http://api.worldbank.org/countries?per_page=500");

        //return the transfer as a string
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

        // $output contains the output string
        $output = curl_exec($ch);
       
        // close curl resource to free up system resources
        curl_close($ch);     
       
        $xml = new SimpleXMLElement($output);
        $result = $xml->xpath('/wb:countries/wb:country/wb:name | /wb:countries/wb:country/wb:capitalCity');
       
        $no_of_countries = count($result)/2;
       
        echo "Country:Capital City<br>";
        for($i = 0;$i<=$no_of_countries;$i++){
            echo $result[2*$i].':'.$result[2*$i+1].'<br>';
        }
?>