从Twitter API使用时出现未定义的索引错误

Question

我试图使用cURL和PHP从Twitter API中提取每日趋势，但是我得到了Undefined index错误。我做错了什么？

这是我的php代码

<?php
$trends_url = "http://api.twitter.com/1/trends/daily.json";

$ch = curl_init(); 

curl_setopt($ch, CURLOPT_URL, $trends_url);

curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

$curlout = curl_exec($ch);

curl_close($ch);

$response = json_decode($curlout, true);

foreach($response as $trend){

$url = $trend['query'];

$name = $trend['name'];

?>

<div class="trend">
    <a href="http://www.twitter.com/<?php echo $url;?>"><?php echo $name;?></a>
</div
<?php
    } 
?>

显示错误：

Notice: Undefined index: query in C:\xampp\htdocs\twitter_trends\index.php on line 22

Notice: Undefined index: name in C:\xampp\htdocs\twitter_trends\index.php on line 24

Answer 1

您与名称/查询的数组相差了两个级别。

foreach($response as $array){
    foreach ($array as $date) {
        foreach ($date as $trend) {
            echo $trend['query'] . "\n";
        }
    }
}

如果您感到困惑，请使用print_r($response)。

Answer 2

您需要更改foreach部分，如下所示：

foreach($response['trends'] as $trend){

    foreach($trend as $trend)
    {
        $url = $trend['query'];

        $name = $trend['name'];

        ?>
        <div class="trend">
            <a href="http://www.twitter.com/<?php echo $url;?>"><?php echo $name;?></a>
        </div>
        <?php
        }
    } 

?>