使用theMovieDB用PHP显示图像海报

$ca = curl_init();
curl_setopt($ca,CURLOPT_URL,"http://api.themoviedb.org/3/configuration?api_key=MYAPIKEY");
curl_setopt($ca,CURLOPT_RETURNTRANSFER,TRUE);
curl_setopt($ca,CURLOPT_HEADER,FALSE);
curl_setopt($ca,CURLOPT_HTTPHEADER,array("Accept: application/json"));
$response = curl_exec($ca);
curl_close($ca);
//var_dump($response);
$config = json_decode($response,true);
//print_r($config);
//$base = $config['base_url'];
//echo($base);

$ch = curl_init();
curl_setopt($ch,"http://api.themoviedb.org/3/search/movie?query=Monsters+University&api_key=MYAPIKEY");
curl_setopt($ch,TRUE);
curl_setopt($ch,FALSE);
curl_setopt($ch,array("Accept: application/json"));
$response = curl_exec($ch);
curl_close($ch);
$result = json_decode($response,true);
//print_r($result);
//var_dump($response);
echo("<img src='" . $config[0]['base_url'] . $config[0]['poster_sizes'][2] . $result[0]['poster_path'] . "'/>");

我现在唯一的问题是我正在尝试回显一个标签来显示海报,但我不确定正确的代码会是什么样的呢？

$responsePHP = json_decode($response);
echo("<img src='" . $responsePHP['poster_path'] . "'/>");

任何帮助,将不胜感激！

编辑：添加了配置数组,但回显没有任何内容.打印出精简版和print_r的JSON似乎与json_decode一起使用,我只是不知道为什么我不能从数组中提取任何值