php中的{“data”：“w-file1”，“attr”：{“rel”：“file”}}的json语法是什么？

Question

获取此json的php代码是什么？

{  "data": "w-file1",
   "attr": { "rel" : "file"}
}

我收到PHP Parse error: syntax error, unexpected T_DOUBLE_ARROW错误

$file = ("data" => "w-file1","attr" => ("rel" => "file"));
echo json_encode($file);

Answer 1

$ file和attr键一样需要是一个数组：

$file = array("data" => "w-file1","attr" => array("rel" => "file"));
echo json_encode($file);

当然，你可以内联它：

echo json_encode(array("data" => "w-file1","attr" => array("rel" => "file")));

或者，有OOP方法：

$file = new stdClass();
$file->data = 'w-file';
$file->attr = new stdClass();
$file->attr->rel = "file";
echo json_encode($file);

Answer 2

您需要为$ file和attr：

指定array

$file = array("data" => "w-file1","attr" => array("rel" => "file"));
echo json_encode($file);

Answer 3

$file = array(
    "data" => "w-file1",
    "attr" => array("rel" => "file")
);
echo json_encode($file);