Explode (Check Box Edit) Using PHP

<div class="form-group">
   <label for="qualification" class="col-sm-2 col-sm-offset-2 control-label">Qualification:</label>
   <div class="col-sm-5">
    <?php
   $check=explode(',',$fetch['Qualification']); 
 ?>
      <div class="checkbox-inline"><label><input type="checkbox" name="chk[]" value="BE" <?php if(in_array('BE',$check)) { echo "checked";} ?>>BE</label></div>
      <div class="checkbox-inline"><label><input type="checkbox" name="chk[]" value="ME" <?php if(in_array('ME',$check)) {echo "checked"; }?>>ME</label></div>
      <div class="checkbox-inline"><label><input type="checkbox" name="chk[]" value="MCA" <?php if(in_array('MCA',$check)) {echo "checked";} ?>>MCA</label></div>
      <div class="checkbox-inline"><label><input type="checkbox" name="chk[]" value="MTECH" <?php if(in_array('MTECH',$check)) {echo "checked";} ?>>MTECH</label></div>
      <div class="checkbox-inline"><label><input type="checkbox" name="chk[]" value="PHD" <?php if(in_array('PHD',$check)) {echo "checked";} ?>>PHD</label></div>
   </div>
 </div> <!---------------In Query Part-------------------------------> 
 $chk1=implode(',',$_POST['chk']); 
 $update=mysqli_query($connect,"update bws set
    Name='".$_POST['sname']."',
    Qualification='".$chk1."'
 where  id='".$_GET['id']."' ") or die(mysqli_error($connect)); 
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