从JSON响应中的键中获取值[duplicate]

Question

如何从json响应中获取键“存在”的值？我之前试过

$json['data']['exists']
and 
$json['data']->exists

但它不起作用。如果我print_r回应，这就是正在打印的内容：

Array ( [exists] => )

我当前的代码：

<?php

    //Initialize cURL.
    $ch = curl_init();

    //Set the URL that you want to GET by using the CURLOPT_URL option.
    curl_setopt($ch, CURLOPT_URL, 'url');

    //Set CURLOPT_RETURNTRANSFER so that the content is returned as a variable.
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

    //Execute the request.
    $data = curl_exec($ch);

    $jsonData = json_decode($data,true);

    print_r($jsonData['data']);

    //Close the cURL handle.
    curl_close($ch);

?>

Answer 1

这是因为«

你将永远不会看到在打印一个布尔值！1代表真，空代表假。

您可以将false value作为字符串发送：'false'