PHP Use the Curl function to send a POST request considerations _php Tips

Objective

A few days ago in the work encountered a demand, when the user clicked a button, the background to initiate a POST request to me, I accept the data passed over. At the outset, colleagues were sent in a common package of corporate frameworks, with the http_request() following code:

 Public Function Http_request ($url, $post = ", $timeout = 5) { 
 if (empty ($url)) {return
  ;
 }
 $ch = Curl_init ();
 curl_setopt ($ch, Curlopt_url, $url);
 curl_setopt ($ch, Curlopt_header, 0);
 curl_setopt ($ch, Curlopt_returntransfer, 1);
 curl_setopt ($ch, Curlopt_ssl_verifypeer, FALSE);
 curl_setopt ($ch, Curlopt_ssl_verifyhost, FALSE);
 
 if ($post!= ' &&!empty ($post)) {
  curl_setopt ($ch, Curlopt_post, 1);
  curl_setopt ($ch, Curlopt_postfields, $post);
  curl_setopt ($ch, Curlopt_httpheader, Array (' Content-type:application/json ', ' content-length: '. strlen ($post)));
 }
 curl_setopt ($ch, Curlopt_timeout, $timeout);
 $result = curl_exec ($ch);
 Curl_close ($ch);
 return $result;
 }

At first I did not notice that the data passed was application/json encoded JSON string, I was in the background directly with the application/x-www-form-urlencoded data to accept the code format to pass through the data (is the direct use of the $_POST way to get), the result of course nothing has been taken. Later, colleagues directly to change the http_request() method, directly pass application/x-www-form-urlencoded the coded format of the data, I did not make changes.

For the above question, I have been wondering why did not get the data passed over.

Today the project was basically completed and studied below.

When a function in PHP curl() makes a POST request, the format of the data can be passed in the following ways:

(1): A key=>value key value pair string that is spliced by a parameter. form as follows:name=xxx&age=23$sex=1

This request parameter is encoded according application/x-www-form-urlencoded to the default.

(2): An array of key values consisting of parameters key=>value (only one-dimensional arrays, and arrays of higher dimensions will complain).

form as follows:

  [name= "xxx", age =%, sex = male]

This request parameter is encoded by default in a multipart/form-data format.

It says that curl() when you make a POST request, you can only pass a one-dimensional array as a passing parameter, so what do you do if you want to pass a multidimensional array?

There are two ways to deal with it, respectively, in the following way 3 and Mode 4.

(3): The multidimensional array is http_build_query() processed to wait until a string of Key=>value key value pairs is formatted.

As shown in the following:

$data = [
          "msg" => "This is a test data",
          "xxx" => "yyyy", "
          msg_data" => [
                          "name" => "Sunms",
                          "age" =>23, "
                          sex" => "male",
                          "content" =>[
                                 1,2,3
                                ]
                       ]
       ;

The following string is obtained:

Msg= This is a test data &xxx=yyyy&msg_data[name]=sunms&msg_data[age]=23&msg_data[sex]= male &msg_data[ Content][0]=1&msg_data[content][1]=2&msg_data[content][2]=3

This method is also application/x-www-form-urlencoded进 encoded by the line, where the receiver can be directly obtained by $_post.

(4): Converts a multidimensional array into a JSON-formatted string, formats the string, application/json obtains the passed-through JSON-formatted string in the receiver's file_get_contents(“php://input”) or $GLOBALS[‘HTTP_RAW_POST_DATA'] way, and then converts the string in JSON format to an array for processing.

$data = [];
$data _string = Json_encode ($data);
.....
Set Header information
curl_setopt ($ch, Curlopt_httpheader, Array (
               ' Content-type:application/json ',
               ' Content-length: '. strlen ($data _string)))
      ;

Note: application/json data that is encoded in the format $_POST is not directly available and needs to be file_get_contents(“php://input”) obtained by or $GLOBALS[‘HTTP_RAW_POST_DATA'] in a way.

Summarize

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