Hi,I am trying to create a graph using chartjs,I am still new on this creating graph and i think i am in big trouble,what i want to achieve is that i am going to get all the number registered employee in each month from jan-dec. and to draw it to a graph with the use of jquery.Ajax,..my question on this do i need to create 12 php script for counting the registered employe in each month ?and how do i set them to the graph ?

This is my code please correct me if i am wrong.

Code:
 $.ajax({
    type: 'post',
    url : 'countemployee.php',
    success: function(data){
      jan = data.january;
      feb = data.february;
     ect...
   }
});
countemployee.php
PHP Code:
$jan='';
 try{
       
//query for the mont of january   
       
$connectionString $db->prepare("select (*) as count from employee   
                                     where date_hired > = '2013-01-01' AND date_hired <= '2013-01-31'"
);

         
$jan $sql->fetchColumn();

 }
catch(){
  
//log error message here.
}

 try{
        
//another count query for month of february
 
}
catch(){
  
//log error message here.
}


 try{
        
//another count query for month of march
 
}
catch(){
  
//log error message here.
}

etc...

encode to json

$month 
= array("$january"=>'$jan',
                      
"$february"=>'$feb',
                     
etc..);

json_encode($month); 

HTML Code:
<!DOCTYPE html>
<html>
<head>
    <meta name="viewport" content="initial-scale = 1, user-scalable = no">
    <script src="Chart.js-master/Chart.js"></script>
</head>
<body>
<canvas id="myChart" height="450" width="600"></canvas>

<script type="text/javascript">


    var data = {
        labels: ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"],
        datasets: [
            {
                fillColor: "rgba(220,220,220,0.5)",
                strokeColor: "rgba(220,220,220,1)",
                data: jan,feb,etc..
            }

        ]
    }


    var ctx = document.getElementById("myChart").getContext("2d");

    new Chart(ctx).Bar(data);

</script>

</body>

</html>