The difference between using arrays and strings in CURLOPT_POSTFIELDS of PHP cURL

We use the following two variables to do the cURL POST test:

<code><span><?php </span><span>// 数组</span><span>$arr_data</span> = [<span>'a'</span> => <span>'apple'</span>];
<span>// 字符串</span><span>$str_data</span> = <span>'{"a":"apple"}'</span>;</span></code>

Then the following is the result printed from the server side:

The above figure analyzes the difference between CURLOPT_POSTFIELDS using arrays and strings from $_SERVER[‘CONTENT_TYPE’], $_POST variables, and php://input respectively.

Finally, we can conclude:
1) When using an array, the Content-Type of the HTTP request header will be set to multipart/form-data;

The content of the array can be obtained from $_POST;
• Use file_get_content("php://input") Is empty, this is also mentioned in the PHP manual:
• php://input is not available with enctype="multipart/form-data"
  
  2) When using strings

The Content-Type of the HTTP request header will be set to application/x-www-form-urlencoded;

The string content will become the key of an element in $_POST;
• The string content can be completely retrieved from php Obtained from ://input;

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The above has introduced the difference between using arrays and strings in CURLOPT_POSTFIELDS of PHP cURL, including the relevant aspects. I hope it will be helpful to friends who are interested in PHP tutorials.