Reading JSON POST using PHP

Question

I looked around a lot before posting this question so my apologies if it is on another post and this is only my second quesiton on here so apologies if I don t format this question correctly   I have a really simple web service that I have created that needs to take post values and return a JSON encoded array  That all worked fine until I was told I would need to post the form data with a content-type of application json  Since then I cannot return any values from the web service and it is definitely something to do with how I am filtering their post values   Basically in my local setup I have created a test page that does the following -   curl   curl init    curl setopt  curl  CURLOPT CUSTOMREQUEST   POST                                                                         curl setopt  curl  CURLOPT POSTFIELDS   data                                                                     curl setopt  curl  CURLOPT RETURNTRANSFER  true                                                                         curl setopt  curl  CURLOPT HTTPHEADER  array                                                                                 Content-Type  application json                                                                                        Content-Length      strlen  data                                                                             curl setopt  curl  CURLOPT URL   http   webservice local         Set the url path we want to call  result   curl exec  curl      see the results  json json decode  result true   curl close  curl   print r  json     On the webservice I have this  I have stripped out some of the functions  -   lt  php  header  Content-type  application json        connect to the db     link   mysql connect  localhost   root   root   or die  Cannot connect to the DB    mysql select db  webservice   link  or die  Cannot select the DB     if isset   POST  action     amp  amp    POST  action       login          statusCode   array  statusCode   gt 1   statusDescription   gt  Login Process - Fail         posts     array  status   gt  statusCode       header  Content-type  application json        echo json encode  posts           disconnect from the db       mysql close  link      gt    Basically I know that it is due to the   POST values not being set but I can t find what I need to put instead of the   POST  I tried  json decode   POST   file get contents  php   input   and a number of other ways but I was shooting in the dark a bit   Any help would be greatly appreciated   Thanks  Steve  Thanks Michael for the help  that was a definite step forward I now have at least got a repsonse when I echo the post    even if it is null   updated CURL -     curl   curl init      curl setopt  curl  CURLOPT HTTPHEADER  array  Content-Type  application json        curl setopt  ch  CURLOPT CUSTOMREQUEST   POST       curl setopt  curl  CURLOPT URL   http   webservice local         curl setopt  curl  CURLOPT RETURNTRANSFER  true     curl setopt  curl  CURLOPT POSTFIELDS  json encode  data      updated php on the page that the data is posted to -   inputJSON   file get contents  php   input     input  json decode   inputJSON  TRUE      convert JSON into array  print r json encode  input      As I say at least I see a response now wheras prior it was returning a blank page

User · Answer

Hello this is a snippet from an old project of mine that uses curl to get ip information from some free ip databases services which reply in json format. I think it might help you.

$ip_srv = array("http://freegeoip.net/json/$this->ip","http://smart-ip.net/geoip-json/$this->ip");

getUserLocation($ip_srv);

Function:

function getUserLocation($services) {

        $ctx = stream_context_create(array('http' => array('timeout' => 15))); // 15 seconds timeout

        for ($i = 0; $i < count($services); $i++) {

            // Configuring curl options
            $options = array (
                CURLOPT_RETURNTRANSFER => true, // return web page
                //CURLOPT_HEADER => false, // don't return headers
                CURLOPT_HTTPHEADER => array('Content-type: application/json'),
                CURLOPT_FOLLOWLOCATION => true, // follow redirects
                CURLOPT_ENCODING => "", // handle compressed
                CURLOPT_USERAGENT => "test", // who am i
                CURLOPT_AUTOREFERER => true, // set referer on redirect
                CURLOPT_CONNECTTIMEOUT => 5, // timeout on connect
                CURLOPT_TIMEOUT => 5, // timeout on response
                CURLOPT_MAXREDIRS => 10 // stop after 10 redirects
            ); 

            // Initializing curl
            $ch = curl_init($services[$i]);
            curl_setopt_array ( $ch, $options );

            $content = curl_exec ( $ch );
            $err = curl_errno ( $ch );
            $errmsg = curl_error ( $ch );
            $header = curl_getinfo ( $ch );
            $httpCode = curl_getinfo ( $ch, CURLINFO_HTTP_CODE );

            curl_close ( $ch );

            //echo 'service: ' . $services[$i] . '</br>';
            //echo 'err: '.$err.'</br>';
            //echo 'errmsg: '.$errmsg.'</br>';
            //echo 'httpCode: '.$httpCode.'</br>';
            //print_r($header);
            //print_r(json_decode($content, true));

            if ($err == 0 && $httpCode == 200 && $header['download_content_length'] > 0) {

                return json_decode($content, true);

            } 

        }
    }

User · Answer

you can put your json in a parameter and send it instead of put only your json in header    post string   json param     json encode  data      open connection  ch   curl init       set the url  number of POST vars  POST data curl setopt  ch CURLOPT POST  1   curl setopt  ch CURLOPT POSTFIELDS   post string   curl setopt  curl  CURLOPT URL   http   webservice local         Set the url path we want to call    execute post  result   curl exec  curl      see the results  json json decode  result true   curl close  curl   print r  json     on the service side you can get  your json string as a parameter    json string     POST  json param     obj   json decode  json string     then you can use your converted data as object

User · Answer

You have empty   POST  If your web-server wants see data in json-format you need to read the raw input and then parse it with JSON decode   You need something like that    json   file get contents  php   input     obj   json decode  json     Also you have wrong code for testing JSON-communication     CURLOPT POSTFIELDS tells curl to encode your parameters as application x-www-form-urlencoded  You need JSON-string here   UPDATE  Your php code for test page should be like that    data string   json encode  data     ch   curl init  http   webservice local     curl setopt  ch  CURLOPT CUSTOMREQUEST   POST    curl setopt  ch  CURLOPT POSTFIELDS   data string   curl setopt  ch  CURLOPT RETURNTRANSFER  true   curl setopt  ch  CURLOPT HTTPHEADER  array           Content-Type  application json            Content-Length      strlen  data string        result   curl exec  ch    result   json decode  result   var dump  result     Also on your web-service page you should remove one of the lines header  Content-type  application json     It must be called only once

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