problem to add multiple data into database

i have made an page which has multiple records i want to save this all record into database but my query fall into else part..each time i run it generate record not added successfully.unable to get the problem please make it easier. there is problem on database query or else .. How to insert multiple data into database I need to multiply text box then insert in one column

<?php 
include 'config.php';
error_reporting(0);
if(isset($_POST['submit'])){
$qualificationArr = $_POST['qualification'];
$subjectArr = $_POST['subject'];
$universityArr = $_POST['university'];
$passingyearArr = $_POST['passingyear'];
$percentageArr = $_POST['percentage'];
    
    if(!empty($qualificationArr)){
        for($i = 0; $i < count($qualificationArr); $i++){
            if(!empty($qualificationArr[$i])){
                $qualification = $qualificationArr[$i];
                $subject = $subjectArr[$i];
                $university = $universityArr[$i];
                $passingyear = $passingyearArr[$i];
                 $percentage = $percentageArr[$i];
               $sql="INSERT INTO addbox(qualification, subject, university, passingyear, percentage)Values('".$qualification."','".$subject."','".$university."','".$passingyear."','".$percentage."')";



if ($conn->query($sql) === TRUE) 
{ 
    echo "New record created successfully";
 }
  else
 {
     echo 'Record not added successfully';
 }

  }   

    }
       }
          }      
?>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css">
<script src="https://code.jquery.com/jquery-2.1.3.js"></script>
<div class="container"> 
   <form method="post">
                        <div class="row">
                                    <div class="col-lg-12 col-12">
         <table class="table table-bordered table-hover" id="tab_logicQual">
            <thead>
               <tr >
                  <th class="text-center">
                     #
                  </th>
                  <th class="text-center">
                     Degree<span class="str"><font color="red">*</font></span>
                  </th>
                  <th class="text-center">
                     Subject<span class="str"><font color="red">*</font></span>
                  </th>
                  <th class="text-center">
                     College/University<span class="str"><font color="red">*</font></span>
                  </th>
                  <th class="text-center">
                     Year of Passing<span class="str"><font color="red">*</font></span>
                  </th>
                  <th class="text-center">
                     Percentage/Grade<span class="str"><font color="red">*</font></span>
                  </th>
               </tr>
            </thead>
            
            <tbody>
               <tr id='addrQual0'>
                  <td>
                  1
                  </td>
               
                  <td>
                  <input type="text" name='qualification[]'  placeholder='Qualification' class="form-control"/>
                  </td>
                  <td>
                  <input type="text" name='subject[]' placeholder='subject' class="form-control"/>
                  </td>
                  <td>
                  <input type="text" name='university[]' placeholder='university' class="form-control"/>
                  </td>
                  <td>
                  <input type="date" name='passingyear[]' placeholder='passingyear' class="form-control"/>
                  </td>
                  
                  <td>
                  <input type="text" name='percentage[]' placeholder='percentage/grade' class="form-control" />
                  </td>
               
                 
               
               </tr>
                    <tr id='ad开发者_运维知识库drQual1'></tr>
            </tbody>
            
         
         </table>
      

      <a id="add_row2" class="btn btn-primary pull-left" style=" background-color: #0d469b; color: white; padding: 3px 8px; text-align: center;display: inline-block; font-size: 16px;cursor: pointer;">Add More</a>   <a id='delete_row2' class="pull-right btn btn-primary" style="background-color: #0d469b; color: white; padding: 3px 8px; text-align: center;display: inline-block; font-size: 16px;cursor: pointer; float: right;">Remove</a>
          
               <div class="clearfix"></div>
               
      </div>   

      <div class="text-center">
                                <input type="submit" name="submit" class="btn btn-primary btn-marketing mt-4" value="Submit" onClick="return encrypt()">
         </form>                            </div>
</div>
      <script>
 $(document).ready(function(){
    var i=1;
   $("#add_row2").click(function(){
    $('#addrQual'+i).html("<td>"+ (i+1) +"</td><td><input name='qualification["+i+"].qualification' type='text' placeholder='Qualification' class='form-control input-md'/> </td><td><input  name='subject["+i+"].subject' type='text' placeholder='Subject'  class='form-control input-md'></td><td><input  name='university["+i+"].university' type='text' placeholder='College'  class='form-control input-md'></td><td><input  name='passingyear["+i+"].passingyear' type='date' placeholder='Passing Year'  class='form-control input-md'></td><td><input  name='percentage["+i+"].percentage' type='text' placeholder='Grade/Percentage'  class='form-control input-md'></td>");

    $('#tab_logicQual').append('<tr id="addrQual'+(i+1)+'"></tr>');
    i++; 
});
   $("#delete_row2").click(function(){
      if(i>1){
       $("#addrQual"+(i-1)).html('');
       i--;
       }
    });

}); 
</script>