"PHP" JSON transfer value and PHP received several cases

Using Chrome's back-end network, we analyzed the $.ajax() Several cases when you post JSON data to PHP:

• JSON data cannot be obtained in PHP via $_post and $_request, i.e.

  $json $_post [' JSON '];  // Empty ($json) is 1

Note: PHP only recognizes application/x-www.form-urlencoded standard data types by default, so content such as text/xml or soap or application/octet-stream cannot be parsed. If you use the $_post array to receive it, it will fail.

Situation A:

JS does not add attribute contenttype: "Application/json; Charset=utf-8 ",

var function () {    $.ajax ({        "post",        ' add-post-json.php ',        false//  Use synchronous mode        ///  1 need to use json.stringify otherwise format for a=2&b=3&now=14        ... // 2 Forced type conversion is required, otherwise the format is {"A": "2", "B": "3"}         data:JSON.stringify ({                              a:parseint ($ (' input[name= "a"] "). Val ()),            B:parseint ($ ( ' input[name= "B"]). Val ()            ),new//  Note Do not add commas on this line         } ),                "JSON",        function(data) {            $ (' #result '). Text ( Data.result);         // be careful not to add commas on this line     });}

• The data cannot be obtained after using the $GLOBALS [' http_raw_post_data '], i.e.

$json $GLOBALS [' Http_raw_post_data '];  // Empty ($json) is 1

• Use File_get_contents ("Php://input"); Data can be obtained, i.e.

$json file_get_contents ("Php://input");   // Empty ($json) is 0

Case B:

JS added attribute contenttype: "Application/json; Charset=utf-8 ",

  var  submit_sync =  function   () {$.ajax ({ Type:  "post" , url:  ' add-post-json.php ' , async:   false, //  use sync  //  1 required to use json.stringify otherwise format is a=2&b=3&now=1 4..  //  2 requires a type cast, otherwise the format is {"A": "2", "B": "3"}   Data:JSON.stringi FY ({a:parseint ($ ( ' input[name= "a"] ' ). Val ()), B:parseint ($ ( /span> ' input[name= "B"] ). Val ()), now:   new  Date (). GetTime () //  Note Do not add a comma  } to this line,  contentType:   "Application/json; Charset=utf-8 " ,   

            "JSON",            function(data) {                $ (' #result '). Text (data.result);             // be careful not to add commas on this line         });    }

• Use $GLOBALS [' Http_raw_post_data '] to get the data, i.e.

$json $GLOBALS [' Http_raw_post_data '];  // Empty ($json) is 0

• Use File_get_contents ("Php://input"); Data can be obtained, i.e.

$json file_get_contents ("Php://input");   // Empty ($json) is 0

Note: Php://input allows you to read the original data of the POST. Compared to $HTTP _raw_post_data, it brings less pressure to memory and does not require any special php.ini settings. Php://input cannot be used for enctype= "Multipart/form-data".

Case C:

Do you want to add the following

Header (' Content-type:application/json;charset=utf-8 ');

There is no effect on the outcome of situation A and condition B.

Starting with version 5.2, PHP native provides the Json_encode () and Json_decode () functions, which are used for encoding, which is used for decoding. The following blog is written in detail, mark!

Using json:http://www.ruanyifeng.com/blog/2011/01/json_in_php.html in the PHP language

The above describes the "PHP" JSON value and PHP received several cases, including aspects of the content, I hope the PHP tutorial interested in a friend helpful.

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