正如大家所说，您做到了-使用json_decode.

As everyone said, and you did - use json_decode.

    $dateArrays  = json_decode($dateTimeArr, true); // decode JSON to associative array
    foreach($dateArrays as $dateArr){
        echo $dateArr['startDate']; 
        echo $dateArr['totalTime']; 
    }

将来，如果不确定变量中包含什么类型的数据或结构，请执行var_dump($var)，它将打印变量的类型及其内容.

In future, if you are unsure what type or structure of data is in the variable, do var_dump($var) and it will print type of variable and its content.