php - FaceBookRequest->execute() makes my ajax call return with status 500 -

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i'm trying make php script receives ajax call facebook application check if id sent user own. user id , access token in next piece of code. function validateme() puts id, letter z separator , access token together, makes ajax call

fb.getloginstatus(function(response) {     if (response.status === 'connected') {         monlogin.uid=response.authresponse.userid;         monlogin.token=response.authresponse.accesstoken;         validateme();     }  }

the php script receives ajax call comes next. returns ajax call status 500 when line $response=request->execute(); not commented. when stop code before line commenting it, returns ajax call status 200. so, believe there makes line not working expected. tried changing name $faceb $session in examples, that's not it. using facebook = new facebook(array) object instead of method setdefaultapplication doesn't trick either because facebook object deprecated.

<?php session_start(); include 'vendor/autoload.php'; use facebook\facebooksession; use facebook\graphobject; use facebook\graphuser; use facebook\facebookrequest; use facebook\facebookresponse; use facebook\facebooksdkexception; use facebook\facebookrequestexception; use facebook\facebookauthorizationexception;  if (isset($globals['http_raw_post_data'])){     $appid='123456';  //not true appid     $psswd='123456abcdef';  //not true password     facebooksession::setdefaultapplication($appid, $psswd);     $infosjoueur = $globals['http_raw_post_data'];     $arraydata = explode('z', $infosjoueur, 2);      // arraydata[1] accesstoken javascript     $session = new facebooksession($arraydata[1]);     $request = new facebookrequest($session, 'get', '/me');     $response = $request->execute();      /*$graph = $response->getgraphobject(graphuser::classname());     $id = $graph->getid();     if (($arrydata[0] = $id)) {         echo 'yes';         $_session['uid']=$id;     }     else {echo 'no';}*/ } ?>

as proposed in comments, checked logs of server , found mbstring method didn't exist because had add in composer.json file. in require, added "ext-mbstring": "*". still error 500 different log:

php fatal error: uncaught exception 'facebook\facebookauthorizationexception' message 'the access token not decrypted'

thank pointing more details on problem in server logs: mb_substr not there default php, have tell php find it.

call undefined function facebook\httpclients\mb_substr() in /app/vendor/facebook/php-sdk-v4/src/facebook/httpclients/facebookcurlhttpclient.‌​php on line 254

the answer can found there facebook php sdk error mb_substr

(then had few bugs added while tweaking code in search of solution removing 2 in explode)


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