签入后，复选框未提供任何值

Question

我尝试使用复选框方法编辑我的选择，检查以前在数据库中的值，而不检查其他值。我尝试做的是检查其他复选框或取消选中上一个选中的复选框，但是当我提交我的版本时，没有任何事情发生，因为它没有从复选框中获取值我不知道为什么。这是我的代码。谢谢

    <?php 
       if(isset($_GET['Institute_Code']))
        {
       $Institute_Code=$_GET['Institute_Code'];
       $getselect=mysqli_query($con,"SELECT radio FROM institute WHERE Institute_Code='$Institute_Code'");
while($row=mysqli_fetch_array($getselect))
{ $Degree_Programs = $row ['radio'];

}}                  
?>
<form action="#" method="post" name="add_Institute">
<div class="container">
 <!--add here-->
          <?php 
                                $char="";
                                $name[]="";
                                $j=0;
                                $dbvalue="";
                    if($Degree_Programs!=NULL )
                    {
                        $Degree_ProgramStrlen=Strlen($Degree_Programs);
                        for ($i=0; $i<=$Degree_ProgramStrlen; $i++)
                    { 
                             $char = substr( $Degree_Programs, $i, 1 );
                        if($char == ',')
                        {
                            //echo $name[$j];
                            //$name="";
                            $j=$j+1;
                            $name[$j]="";
                        }
                        else
                        {
                            $name[$j] .= $char;
                        }

                    }
                    } 

                    else
                    {} ?>
                <!--" >-->

 <div class="row col-md-offset-1">
          <div class="col-md-9 ">
                <?php echo "<b>Degree Programs</b>"; ?> 
                <br>
                <?php  for($i=0;$i<count($name)-1;$i++) 
                {   if($name[$i]=='Matric Arts')
                    $dbvalue=$name[$i];
                } ?>
                <label>Matric Arts</label>
 <input type="checkbox" name="check_DegreePrograms[]"  value="Matric Arts"  <?php
                $value="Matric Arts";
                echo ( $dbvalue==$value ? 'checked' : '');?>>
                <?php  for($i=0;$i<count($name)-1;$i++) 
                {   if($name[$i]=='Matric Science')
                    $dbvalue=$name[$i];
                } ?>
                <label for="tag_2">Matric Science</label>
 <input type="checkbox" name="check_DegreePrograms[]" id="tag_2" value="Matric Science" <?php
                $value="Matric Science";
                echo ( $dbvalue==$value ? 'checked' : '');?>>
                <?php  for($i=0;$i<count($name)-1;$i++) 
                {   if($name[$i]=='FSc. Pre-Engineering')
                    $dbvalue=$name[$i];
                } ?>
 <label for="tag_3">FSc. Pre-Engineering</label>
 <input type="checkbox" name="check_DegreePrograms[]" id="tag_3" value="FSc. Pre-Engineering" <?php
                $value="FSc. Pre-Engineering";
                echo ( $dbvalue==$value ? 'checked' : '');?>>
                <?php  for($i=0;$i<count($name)-1;$i++) 
                {   if($name[$i]=='Fsc. Pre-Medical')
                    $dbvalue=$name[$i];
                } ?>
                <label for="tag_4">FSc. Pre-Medical</label>
 <input type="checkbox" name="check_DegreePrograms[]" id="tag_4" value="FSc. Pre-Medical"<?php
                $value="FSc. Pre-Medical";
                echo ( $dbvalue==$value ? 'checked' : '');?>>
                <?php  for($i=0;$i<count($name)-1;$i++) 
                {   if($name[$i]=='I.com')
                    $dbvalue=$name[$i];
                } ?>
                </div>
                </div>
 <input type="Submit" name="Submit" value="Submit" class="btn btn-success pull-right"/>
 </form>
 </div>
 <?php   //} } 

 $pets ="";
 $flag =0;       
 if(isset($_GET['Institute_Code']))
 {
 $Institute_Code=$_GET['Institute_Code'];
 if (isset($_POST['Submit'])) {
 if(isset($_POST['submit'])){//to run PHP script on submit
 if(!empty($_POST['check_DegreePrograms'])){
 // Loop to store and display values of individual checked checkbox.
 foreach($_POST['check_DegreePrograms'] as $selected){
     $pets .= $selected . ",";
     $flag = 1;

 } 
 }
 }  
 if ($flag == 1) {

    $pets = rtrim($pets);

 }


  $updated =  mysqli_query($con ,"UPDATE institute set  radio='$pets' where Institute_Code=1233");

   if($updated)
 {

 echo "Data successfully updated...";  
 }
 else {
   die('Could not update data: ' . mysql_error());  
 }

 }
 }
 ?>
 <?php
 include 'footer.php';
 ?>'