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<?php
$required = "<font color='#FF0000' size='1'>*</font>";
$conn = mysqli_connect(SYSTEM_DBHOST,SYSTEM_DBUSER,SYSTEM_DBPWD,SYSTEM_DBNAME);
$fdata = array();

/*************************************/
$id=$_GET['id'];
$bquery=mysqli_query($conn, "select * from tbl_course where id='$id'");
$brow=mysqli_fetch_array($bquery);

if ($_POST['act'] == 'editcourse') {
       
	$cosname = mysqli_real_escape_string($conn, $_REQUEST['cosname']);
	$dt = date('Y-m-d');

$sql = "UPDATE `tbl_course` SET `cosname`='$cosname' WHERE id='$_REQUEST[upd_id]'";

//print $sql;exit;
    $rs = mysqli_query($conn, $sql);
    $msg = "Record Updated Successfully.";
    print "<script>";
    print "self.location = 'manage_course.php?msg=$msg';";
    print "</script>";
}

<div class="content_header">
  <div class="heading flleft">Edit </div>
  <div class="heading flright"><a href="<?=$_curpage?>">&laquo; Back</a></div>
</div>
<div class="bodycontent">
  <form  name="form1" method="post" action="" enctype="multipart/form-data" onsubmit="return validate();">
   	<input type="hidden" name="upd_id" value="<?php echo $id;?>" />
    <input type="hidden" name="act" value="editcourse">
	<div id="validation_div" class="validation_error"></div>
    <table width="100%" cellpadding="3" cellspacing="0" border="0" align="center">
   	
    <tr>
      <td align="left" class="label">Grade Name <?=$required?></td>
      <td align="center">:</td>
      <td align="left"><input type="text" required="" value="<?php echo $brow['cosname'];?>" name="cosname" size="50" /></td>
    </tr>    
    <tr>
      <td colspan="3" align="center"><p><INPUT type="submit" value="Update" class="button" /></p></td>
    </tr>
	</table>
  </form>
</div>