我无法通过谷歌搜索api获得50个结果记录

这是我的代码。这对10张唱片来说很好。但是当我增加数字时，它会提示错误。请检查一下，如果你有任何解决方案请告诉我。

    Thanks in advance,
    Ravi Sharma
    Softobiz Technologies 
<?php
    # JSON SEARCH RESULT
    // This example request includes an optional API key which you will need to
    // remove or replace with your own key.
    // Read more about why it's useful to have an API key.
    // The request also includes the userip parameter which provides the end
    // user's IP address. Doing so will help distinguish this legitimate
    // server-side traffic from traffic which doesn't come from an end-user.
    $url = 'https://www.googleapis.com/customsearch/v1?key=AIzaSyC4o52-Q90FxNzMxY9FNryrONierFS3la8&cx=016278085151347603490%3Affuoqez1cew&q=ravi&num=20';
    // sendRequest
    // note how referer is set manually
    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
    curl_setopt($ch, CURLOPT_REFERER, '202.164.43.51');
    $body = curl_exec($ch);
    curl_close($ch);
    // now, process the JSON string
    $array = json_decode($body);
    // now have some fun with the results...
    echo "<pre>";
    print_r($array);
    ?>