<?php

require 'vendor/autoload.php';
use Plivo\RestAPI;
$auth_id = "Your AUTH_ID";
$auth_token = "Your AUTH_TOKEN";
$p = new RestAPI($auth_id, $auth_token);
$params = array('call_uuid' => 'fcef9018-aec6-11e4-8449-c73b3246dc2a');
// Get all Live Calls
$response = $p->get_live_call($params);
print_r($response);
/*
Sample Output
( 
    [status] => 200 
    [response] => Array ( 
        [calls] => Array (
            [0] => a60f44dc-926f-11e4-82f5-b559cbfe39b9
            [1] => af399206-926f-11e4-8b6f-fd067af138be
        )
        [api_id] => 44abd2a4-aec7-11e4-ac1f-22000ac51de6  
    ) 
)
*/
$uuids = $response['response']['calls'];
// Looping through the call uuids
foreach ($uuids as $value) {
    print_r("Calls : {$value} <br>");
}
/* 
Sample Output