Question

我正在尝试使用json_decode从本帖子底部附带的代码的“大学”部分获取“short_name” - 它来自Coursera（在线课程网站）。

我先做：

$Course= json_decode(file_get_contents(COURSES_URL), true);

然后通过执行以下操作获取顶级数据（例如“id”）没有问题：

$CourseId = $Course['id'];

但是当谈到“大学”阵列时，我无法访问任何数据，我不断得到“Undefined index：short_name”我尝试了各种各样的，例如：

$university= $Course['universities']['short_name'];

但我现在无处可去......你如何获取这些数据？

Coursera JSON：

[
{
"subtitle_languages_csv":"",
"photo":"https://s3.amazonaws.com/coursera/topics/ml/large-icon.png",
"preview_link":"https://class.coursera.org/ml/lecture/preview",
"small_icon_hover":"https://s3.amazonaws.com/coursera/topics/ml/small-icon.hover.png",
"large_icon":"https://s3.amazonaws.com/coursera/topics/ml/large-icon.png",
"video":"e0WKJLovaZg",
"university-ids":[
"stanford"
],
"id":2,
"universities":[
{
"rectangular_logo_svg":"",
"wordmark":null,
"website_twitter":"",
"china_mirror":2,
"favicon":"https://coursera-university-assets.s3.amazonaws.com/dc/581cda352d067023dcdcc0d9efd36e/favicon-stanford.ico",
"website_facebook":"",
"logo":"https://coursera-university-assets.s3.amazonaws.com/d8/4c69670e0826e42c6cd80b4a02b9a2/stanford.png",
"background_color":"",
"id":1,
"location_city":"Palo Alto",
"location_country":"US",
"location_lat":37.44188340000000000,
"location":"Palo Alto, CA, United States",
"primary_color":"#8c1515",
"abbr_name":"Stanford",
"website":"",
"description":"The Leland Stanford Junior University, commonly referred to as Stanford University or Stanford, is an American private research university located in Stanford, California on an 8,180-acre (3,310 ha) campus near Palo Alto, California, United States.",
"short_name":"stanford",
"landing_page_banner":"",
"mailing_list_id":null,
"website_youtube":"",
"partner_type":1,
"banner":"",
"location_state":"CA",
"name":"Stanford University",
"square_logo":"",
"square_logo_source":"",
"square_logo_svg":"",
"location_lng":-122.14301949999998000,
"home_link":"http://online.stanford.edu/",
"class_logo":"https://coursera-university-assets.s3.amazonaws.com/21/9a0294e2bf773901afbfcb5ef47d97/Stanford_Coursera-200x48_RedText_BG.png",
"display":true
}
],

Answer 1

universities是一个元素数组，因此在进入大学财产之前使用0索引：

$university= $courseraCourse['universities'][0]['short_name'];

如果返回的JSON包含多个大学，您可以遍历它：

foreach($courseraCourse['universities'] as $university) {
    echo $university['short_name'] . '<br>' ;
}

从php中的数组中获取JSON数据

1 个答案: