Fatal error: Call to undefined function json_decode() in

[Ibshas25]

i seem to be getting this error and cant figure it out..

 

?php
  require_once("connectdb.php"); 
/*Connect to your Database
  $conn = mysql_connect("127.0.0.1", "root", "kasapogluo") 
or die("Could not connect to MySQL Server: " . mysql_error());

//Select your Database
  mysql_select_db("test") 
or die("Could not select database");
*/

$req = json_decode(stripslashes($_POST['data']), true);
$req["SuccFail"]="fail";
$req["SuccFailMessage"]="Error Occured.";
//$logFile = 'logFile';
// error_log("isl=baþladý: ", 3, $logFile);
if ($req['operation'] == "usersearch") // select için veri geldi
{
   // error_log("isl==select oluþuyor: ", 3, $logFile);
    $sql= "select usr_id, usr_username,usr_name,usr_surname,usr_isuseractive from  users";
    $sql.=" where (usr_name is null or  usr_name like '".  $req['user'][0]['name']."%'  )  and ";
    $sql.= "(usr_surname is null or usr_surname  like '".  $req['user'][0]['surname']."%'  ) ";  
$sql .= " order by usr_name , usr_surname";
// error_log($sql, 3, $logFile);

//error_log("sql: ".$sql, 3, $logFile);
//error_log("\n", 3, $logFile);

    $result = mysql_query($sql);
    $reslist = "<table border='1'><tr><th>User Id</th><th>Username</th><th>Name</th><th>Surname</th><th>Is Active</th></tr>";
    
   while($row = mysql_fetch_array($result))
   {
	 // error_log("user: ".$row['usr_name']." surname :".$row['usr_username'], 3, $logFile);
	  $user = $row['usr_name']." ".$row['usr_surname'];
	  $reslist .= "<tr><td><a href='#' onclick='javascript:UserSearchChoose(".$row['usr_id'].",".chr(34).$row['usr_name'].chr(34).",".chr(34).$row['usr_surname'].chr(34).");'>".$row['usr_id']."</a></td><td>" . $row['usr_username'] . "</td><td>" . $row['usr_name'] . "</td>";
	  $reslist .= "<td>" . $row['usr_surname'] . "</td><td>" . $row['usr_isuseractive'] . "</td></tr>"; 
   }
	// error_log("$reslist: ".$reslist, 3, $logFile);
   $reslist .= "</table>";
   
   // error_log("$reslist: ".$reslist, 3, $logFile);
   // error_log("\n", 3, $logFile);
   
   
   $req["SuccFail"]="success"; //operation success or fail
   $req["SuccFailMessage"]="successfully selected.";
   //alert($reslist);
   $req["ResultData"]=$reslist;
   mysql_close($conn); 
   header("Content-type: text/plain");
   echo json_encode($req); 
   return;
   } 
  else  if ($req['operation'] == "rolesearch") // select için veri geldi
   {
	$sql= "select rol_Id, rol_name from roles order by rol_name";
	$result = mysql_query($sql);
	$reslist = "<select id='roles' name='roles'>";
         while($row = mysql_fetch_array($result))
          {	
		$reslist .= "<option value='".$row['rol_Id']."' ";

		if($row['rol_Id']==1)
		{
			$reslist .= " selected ";
		}
		$reslist .= " >".$row['rol_name']."</option>";
	 }
	//error_log("$reslist: ".$reslist, 3, $logFile);
	//error_log("\n", 3, $logFile);


	$req["SuccFail"]="success"; //operation success or fail
	$req["SuccFailMessage"]="successfully selected.";
	//alert($reslist);
	$req["ResultData"]=$reslist;
	mysql_close($conn); 
	header("Content-type: text/plain");
	echo json_encode($req); 
	return;
}
else if ($req['operation'] == "teamslist") // select için veri geldi
   {
   // error_log("isl==teamslist select oluþuyor: ", 3, $logFile);
   $sql="select tea.tea_id,tea.tea_projectId, prj.prj_projectname , tea.tea_userId,usr.usr_name,usr.usr_surname,tea.tea_rolId,rol.rol_name 
   from teams as tea  
   LEFT JOIN projects as prj  ON prj .prj_id  =  tea.tea_projectId 
   LEFT JOIN users as usr  ON usr.usr_id  =  tea.tea_userId   
   LEFT JOIN roles as rol  ON rol.rol_Id  =  tea.tea_rolId  
where tea.tea_projectId =".$req['teams'][0][projectid];
$sql.=" order by usr.usr_name , usr.usr_surname ,prj.prj_projectname ";
/*
  (usr.usr_name is null or  usr.usr_name  like 'ib%' )  and 
           (usr.usr_surname is null or usr.usr_surname  like '%' )   
order by usr.usr_name , usr.usr_surname ,prj.prj_projectname
    $sql= "select usr_id, usr_username,usr_name,usr_surname,usr_isuseractive from  users";
    $sql.=" where (usr_name is null or  usr_name like '".  $req['user'][0]['name']."%'  )  and ";
    $sql.= "(usr_surname is null or usr_surname  like '".  $req['user'][0]['surname']."%'  ) ";  
$sql .= " order by usr_name , usr_surname";
*/
//error_log("sql: ".$sql, 3, $logFile);
//error_log("\n", 3, $logFile);

    $result = mysql_query($sql);
    $reslist = "<table border='1'><tr><th>Team Id</th> <th>Role</th> <th>Name</th> <th>Surname</th> </tr>";
    
   while($row = mysql_fetch_array($result))
   {
	 // error_log("user: ".$row['usr_name']." surname :".$row['usr_username'], 3, $logFile);
	  //$user = $row['usr_name']." ".$row['usr_surname'];
	  $reslist .= "<tr><td><a href='#' onclick='javascript:TeamListChoose(".$row['tea_id'].",".$row['tea_projectId'].",".$row['tea_userId'].",".$row['tea_rolId'].",".chr(34).$row['usr_name'].chr(34).",".chr(34).$row['usr_surname'].chr(34).");'>".$row['tea_id']."</a></td><td>" . $row['rol_name'] . "</td><td>" . $row['usr_name'] . "</td>";
	  $reslist .= "<td>" . $row['usr_surname'] . "</td></tr>"; 
   }
	// error_log("$reslist: ".$reslist, 3, $logFile);
   $reslist .= "</table>";
   
   // error_log("$reslist: ".$reslist, 3, $logFile);
   // error_log("\n", 3, $logFile);
   
   
   $req["SuccFail"]="success"; //operation success or fail
   $req["SuccFailMessage"]="successfully selected.";
   //alert($reslist);
   $req["ResultData"]=$reslist;
   mysql_close($conn); 
   header("Content-type: text/plain");
   echo json_encode($req); 
   return;
   } 
   
   else if ($req['operation'] == "teamdelete") // teams silmek için geldi.
   {
      //error_log("isl==teamdelete: ", 3, $logFile);
      //$sql="delete from teams where tea_id=".$req['teamid']; 
      mysql_query("delete from teams where tea_id=".$req['teamid']);
  
//error_log("mysql_affected_rows= ".mysql_affected_rows($con), 3, $logFile); 
      //var $affrows = mysql_affected_rows();
  
   if ( mysql_affected_rows() > 0 ) {
	  $req["SuccFail"]="success"; //operation success or fail
	  $req["SuccFailMessage"]="successfully deleted.";
	  //error_log("isl==teamdelete:success ", 3, $logFile);
   }
   else {
	   $req["SuccFail"]="fail"; //operation success or fail
	   $req["SuccFailMessage"]="error occured ". mysql_error();
	  // error_log("isl==teamdelete:fail ", 3, $logFile);
   }
      
   mysql_close($conn); 
   header("Content-type: text/plain");
   echo json_encode($req); 
   return;
   } 
   
    else if ($req['operation'] == "teamadd") // teams silmek için geldi.
   {
      //error_log("isl==teamdelete: ", 3, $logFile);
      //$sql="delete from teams where tea_id=".$req['teamid']; 
     
  $sql="insert into teams VALUES (null,". $req['projectId'].",".$req['userId'].",".$req['rolId'].",now(),".$req['recuser'].")";
   mysql_query($sql);

  
//error_log($sql, 3, $logFile); 
      //var $affrows = mysql_affected_rows();
  
   if ( mysql_affected_rows() > 0 ) {
	  $req["SuccFail"]="success"; //operation success or fail
	  $req["SuccFailMessage"]="successfully deleted.";
	  //error_log("isl==teamdelete:success ", 3, $logFile);
   }
   else {
	   $req["SuccFail"]="fail"; //operation success or fail
	   $req["SuccFailMessage"]="error occured ". mysql_error();
	  // error_log("isl==teamdelete:fail ", 3, $logFile);
   }
      
   mysql_close($conn); 
   header("Content-type: text/plain");
   echo json_encode($req); 
   return;
   } 
?>

[Ibshas25]

Fatal error: Call to undefined function json_decode() in /export/SOI-50/students/m2009/abhr428/web/WebIbs/teams.php on line 12