PHP For Loop help

for loop is not working for me in php i tried a lot for this can any one please check my code.i need send education details like qualifiction,years,university,percent into php table

for($i=1;$i<=4;$i++){

$qa="Qualification"+$i;

$Qualification = "";
if(isset($_POST['Qualification1'+$i])){
    $Qualification = $_POST['Qualification'.$i];
 }  
 echo"-----------";
echo $Qualification;
$Years= "";
if(isset($_POST['Years'+$i])){
    $Years = $_POST['Years'+$i];
 } 

$University = "";
if(isset($_POST['University'+$i])){
    $University = $_POST['University'+$i];
 } 

$Percentage = "";
if(isset($_POST['Percentage'+$i])){
    $Percentage = $_POST['Percentage'+$i];
 } 

echo"222222222";
echo $Qualification;
if($Qualification != null){
    echo "333333333";

 $qry = "INSERT INTO emp_qualification(EmployeeID,Qualification,Years,University,Percentage)
        VALUES('$EmployeeID','$Qualification','$Years','$University','$Percentage')";

        if ($conn->query($qry)==TRUE){
        echo " qulaification details added successfully";
    }
    else 
        echo "<br/> not added.";

}
}

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