How to create Multipurpose Plugin Add Edit Function.

 <?php

ob_start();
/*
Plugin Name:Manjeet Kashyap
Plugin URI: localhost
Description: Declares a plugin that will create a custom post type displaying movie reviews.
Version: 1.0
Author: a1
Author URI:Localhost
License: GPLv2
*/
?>
<?php
function create_menu() {

add_menu_page('cm panel', 'Resigistration', '',  __FILE__, 'settings_page');

add_submenu_page(  __FILE__, 'New_Resigistration', 'New_Resigistration', 'manage_options', 'my-submenu-handle1','settings_page');

add_submenu_page(  __FILE__, 'User_Details', 'User_Details', 'manage_options', 'my-submenu-handle2','section_1');

add_submenu_page(  __FILE__, '', '', 'manage_options', 'my-submenu-handle3','section_2');

}


function settings_page()
{
include('upload1.php');
}

function section_1()
{
include('floor_image.php');
}


function section_2()
{

   $gid=$_GET['id'];

$a="select * from wp_usersinfo where id=$gid";
$res=mysql_query($a);
?>
<form action="" method="post" class="regty" enctype="multipart/form-data">
<?php
while($row=mysql_fetch_array($res)){
?>
<div class="nn1"><span class="lab1">Name</span> <input type="text" name="name_2" value="<?php echo $row['name'];?>"/></div>
<div class="nn1"><span class="lab1">About us</span><textarea cols="59" rows="5" name="about_us_2"><?php echo $row['aboutus'];?></textarea></div>
<div class="nn1"><span class="lab1">Upload Profile image</span><input type="file" name="Photo2" />
<img src="<?php echo bloginfo('template_url').'/images/'.$row['image_name']; ?>" width="125" height="100">
</div>
<div class="nn1"><input type="submit" name="update" value="Update" class="subtn"></div>
<?php
}
?>
</form>

<?php


if(isset($_POST['update'])){
$uploadDir = get_template_directory().'/images/';
$fileName = $_FILES['Photo2']['name'];
$tmpName = $_FILES['Photo2']['tmp_name'];
$fileSize = $_FILES['Photo2']['size'];
$fileType = $_FILES['Photo2']['type'];
$filePath = $uploadDir.$fileName;
$livepath=bloginfo('template_url').'/images/'.$fileName;
$result = move_uploaded_file($tmpName, $filePath);
$a="UPDATE wp_usersinfo SET name='".$_POST['name_2']."'
,image_name='".$fileName."',
image_path='".$filePath."',
aboutus='".$_POST['about_us_2']."'
where id='$gid'";
mysql_query($a) or die(mysql_error());
$admin = admin_url();
header('location:'.$admin.'admin.php?page=my-submenu-handle2');
         }
    }
?>
<?php

/*
function myplugin_activate()
{
global $wpdb;

global $usersinfo_table;

$usersinfo_table = 'wp_usersinfo';

$sql= "CREATE TABLE $table
(id INT( 10 ) NOT NULL AUTO_INCREMENT PRIMARY KEY ,
name VARCHAR(250),
image_name VARCHAR( 250 ) NULL ,
image_path VARCHAR( 250 ) NULL ,
aboutus MEDIUMTEXT NULL ,
 )";

require_once(ABSPATH . 'wp-admin/includes/upgrade.php');
dbDelta($sql);

} */

register_activation_hook( __FILE__, 'myplugin_activate' );
add_action('admin_menu','create_menu');

?>

=============================================================

<style>
.nn1{ float: left;padding: 7px 0; width: 100%;}.nn1 span.lab1 {float: left;width: 14%;}.nn1 input, .nn1 textarea {float: right;margin-right: 2%;width: 80%;}.lab1 input[type="radio"] {float: right; width: auto;}selectorSavingError {
}
</style>
<div class="wrap">
<h2>Registration Form</h2>
</div>
<form action="" method="post" class="regty" enctype="multipart/form-data">
<div class="nn1"><span class="lab1">Name</span> <input type="text" name="name_1" /></div>
<div class="nn1"><span class="lab1">About us</span><textarea cols="59" rows="5" name="about_us_1"></textarea></div>
<div class="nn1"><span class="lab1">Upload Profile image</span><input type="file" name="Photo" /></div>
<div class="nn1"><input type="submit" name="submit" value="submit" class="subtn"></div>
</form>
<?php        
$_POST['Photo'];
$about=$_POST['about_us_1'];
    $name=$_POST['name_1'];

if(isset($_POST['submit']))
{
$imgp=$_POST['Photo'];
$name=$_POST['name_1'];
$url=bloginfo('template_url');
$uploadDir = get_template_directory().'/images/';
$fileName = $_FILES['Photo']['name'];
$tmpName = $_FILES['Photo']['tmp_name'];
$fileSize = $_FILES['Photo']['size'];
$fileType = $_FILES['Photo']['type'];
$filePath = $uploadDir.$fileName;
$livepath=bloginfo('template_url').'/images/'.$fileName;
$result = move_uploaded_file($tmpName, $filePath);


if (!$result) {
echo "Error uploading file";
//exit;
}

if(!get_magic_quotes_gpc())
{
$fileName = addslashes($fileName);
$filePath = addslashes($filePath);
}

$table="wp_usersinfo";
 echo $a="insert into wp_usersinfo set name='".$name."' ,
 image_name='".$fileName."',
 image_path='".$filePath."',
 aboutus='".$about."'";
mysql_query($a) or die(mysql_error());
$admin = admin_url();

header('location:'.$admin.'admin.php?page=my-submenu-handle2');
}

================================================================

<?php

include('../../../wp-config.php');
$admin = admin_url();
$uid=$_GET['id'];
$table = 'wp_usersinfo';
$del=mysql_query("DELETE FROM $table WHERE id=$uid");
header('location:'.$admin.'admin.php?page=my-submenu-handle2');
?>

====================================================================

<table border="2">
<tr><th>Id</th>
<th>Name</th>
<th>About us</th>
<th>Image</th>
</tr>
<?php
$admin = admin_url();
$url = plugins_url();
$s="select * from wp_usersinfo";
$result=mysql_query($s);
while($row=mysql_fetch_array($result))
{
echo '<tr><td>'.$row['id'].'</td><td>'.$row['name'].'</td><td>'.$row['aboutus'].'</td><td><img  width="100px" height="100px" src="http://localhost:90/wordpress/wp-content/themes/twentyfourteen/images/'.$row['image_name'].'"/>';
?>
<td>
<a href="<?php echo $admin.'admin.php?page=my-submenu-handle3&id='.$row['id'];?>"><input type="button" name="edit" value="Edit"><a></td>
<td>
<a href="<?php echo $url.'/madhukar/delete.php?id='.$row['id'];?>"><input type="button" name="Delete" value="Delete" ></a>
</td>

</tr>
<?php
}
?>
</table>