PHP Curl Curlopt_postfields using arrays and string differences

We use these two variables to do the Curl post test separately:

   
    // 数组$arr_data = ['a' => 'apple'];// 字符串$str_data = '{"a":"apple"}';

Then the following is the result of printing from the server side:

The above diagram parses the CURLOPT_POSTFIELDS difference between using an array and a string, respectively, from $ _server[' Content_Type ', $ _post variable, and php://input.

Finally, we can conclude that:
1) when using the array

• HTTP request Header Content-type will be set to Multipart/form-data;
• The contents of the array can be obtained from $_post;
• Using File_get_content ("Php://input") is empty, and for this, the PHP manual also says:
  

  Php://input isn't available with enctype= "Multipart/form-data"

2) when using a string

• HTTP request Header Content-type will be set to application/x-www-form-urlencoded;
• The string content becomes the key of an element inside the $_post;
• The string contents can be obtained from the php://input completely;

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