PHP: how to get variables from a JSON(sent from a Swift iOS app) and respond with a JSON -

i developing ios app swift should fetch data mysql database according user's location. don't know php , couldn't find resource explains how receive data app.

i have php code:

<?php  // create connection $con=mysqli_connect("localhost","*******","*******","*******");  // check connection if (mysqli_connect_errno()) {   echo "failed connect mysql: " . mysqli_connect_error(); }  // sql statement selects table 'locations' $sql = "select * *******";  // check if there results if ($result = mysqli_query($con, $sql)) {      // if so, create results array , temporary 1     // hold data     $resultarray = array();     $temparray = array();      // loop through each row in result set     while($row = $result->fetch_object())     {         // add each row our results array         $temparray = $row;         array_push($resultarray, $temparray);     }      // finally, encode array json , output results     echo "{ \"posts\": ";     echo json_encode($resultarray);     echo "}"; }  // close connections mysqli_close($con); ?> 

as can see when called gets data table , returns json. next step want send location swift app code:

@ibaction func submitaction(sender: anyobject) {              //declare parameter dictionary contains string key , value combination.             var parameters = ["name": nametextfield.text, "password": passwordtextfield.text] dictionary<string, string>              //create url nsurl              let url = nsurl(string: "http://myservername.com/api") //change url              //create session object              var session = nsurlsession.sharedsession()              //now create nsmutablerequest object using url object             let request = nsmutableurlrequest(url: url!)              request.httpmethod = "post" //set http method post              var err: nserror?             request.httpbody = nsjsonserialization.datawithjsonobject(parameters, options: nil, error: &err) // pass dictionary nsdata object , set request body              request.addvalue("application/json", forhttpheaderfield: "content-type")             request.addvalue("application/json", forhttpheaderfield: "accept")              //create datatask using session object send data server             var task = session.datataskwithrequest(request, completionhandler: {data, response, error -> void in                 println("response: \(response)")                 var strdata = nsstring(data: data, encoding: nsutf8stringencoding)                 println("body: \(strdata)")                 var err: nserror?                 var json = nsjsonserialization.jsonobjectwithdata(data, options: .mutableleaves, error: &err) as? nsdictionary                  // did jsonobjectwithdata constructor return error? if so, log error console                 if(err != nil) {                     println(err!.localizeddescription)                     let jsonstr = nsstring(data: data, encoding: nsutf8stringencoding)                     println("error not parse json: '\(jsonstr)'")                 }                 else {                     // jsonobjectwithdata constructor didn't return error. but, should still                     // check , make sure json has value using optional binding.                     if let parsejson = json {                         // okay, parsedjson here, let's value 'success' out of                         var success = parsejson["success"] as? int                         println("succes: \(success)")                     }                     else {                         // woa, okay json object nil, went worng. maybe server isn't running?                         let jsonstr = nsstring(data: data, encoding: nsutf8stringencoding)                         println("error not parse json: \(jsonstr)")                     }                 }             })              task.resume()         } 

courtesy http://jamesonquave.com/blog/making-a-post-request-in-swift/

and don't know how "get"(accept, function use) json:

{"items": [             {                 "minlat": "43.000000",                 "maxlat": "44.000000",                 "minlon": "-79.000000",                 "maxlon": "-78.000000",             }           ]     } 

from app in order have in php:

$minlat = $json['minlat']; $maxlat = $json['maxlat']; $minlon = $json['minlon']; $maxlon = $json['maxlon'];  $sql = "select * ******* latitude between".$minlat." , ".$maxlat." , longitude between ".$minlon." , ".$maxlon; 

thank you

the answer incredibly stupid-easy:

firstly nothing worked before commented these 2 lines:

request.addvalue("application/json", forhttpheaderfield: "content--type") request.addvalue("application/json", forhttpheaderfield: "accept") 

then used string instead of json send post data(it surely works json also, works @ moment):

let request = nsmutableurlrequest(url:myurl!); request.httpmethod = "post";  let poststring = "minlat=43.0&maxlat=44.0&minlon=26.0&maxlon=27.0";  request.httpbody = poststring.datausingencoding(nsutf8stringencoding); 

and @ server side simply:

$minlat = $_request["minlat"]; $maxlat = $_request["maxlat"]; $minlon = $_request["minlat"]; $maxlon = $_request["maxlat"]; 

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