<?php

$answer = '[{"call_id":"147532********************200","sip":"100","callstart":"2016-10-01 16:30:36","clid":"Operator (100) ","destination":"8***************","disposition":"answered","seconds":"3","is_recorded":"true","pbx_call_id":"out_************************************"},{"call_id":"14753****************3","sip":"100","callstart":"2016-10-01 16:31:06","clid":"Operator (100) ","destination":"89**************","disposition":"answered","seconds":"2","is_recorded":"true","pbx_call_id":"out_**********************************"}]';
$answerObject = json_decode($answer);
print_r($answerObject);
echo '====================================', PHP_EOL;
foreach ($answerObject as $value) {
	echo $value->call_id, PHP_EOL;
}