[php] 解析JSON字符串

$json_str = '{"thumb":"","photo":[{"url":"557a3d2184db0.png","alt":"SafeBoot\u6ce8\u518c\u8868"}]}';  // json字符串
$obj = json_decode($json_str);
$photo = $obj->photo;
$url = $photo[0]->url; // echo url; //557a3d2184db0.png

  

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