How to customize login process

You can use this function in functions.php of your current theme
It will show an extra field on login form

###################Code starts here ###################
<?php

add_action('login_form', 'add_login_field');
function add_login_field()
{
?>    
  <p>
      <label for="user_pass">My Input<br>
      <input type="text" name="my_name" value=""/>
  </p>
<?php  
}

function do_anything($user) {
    //do stuff

   $userdata= $user = get_userdatabylogin($user);
   $user_id = $userdata->ID;

   $my_name = $_POST['my_name'];



   add_user_meta( $user_id, 'my_name', $my_name);

}

add_action('wp_login', 'do_anything');
?>
############## CODE ENDS HERE ###################

The above code will create an extra field on the login form .
This value will be posted with other values that can be received in “do_anything($user)” function. Finally this value can be saved as User meta.

Part 2=======================================================================

add_action('login_form', 'add_login_field');
function add_login_field()
{

?>    
       <p>
  <label for="user_pass">My Input<br>
  <input type="text" name="my_name" value=""/>
 </p>


 <?     
    }

function do_anything($user) {

    //do stuff

   $userdata= $user = get_userdatabylogin($user);
   $user_id = $userdata->ID;

   $my_name = $_POST['my_name'];


add_user_meta( $user_id, 'my_name', $my_name);
}
add_action('wp_login', 'do_anything');


add_filter('authenticate', 'check_login', 10, 3);

function check_login($user, $username, $password) {
  global $wpdb;  
if(isset($_POST['my_name']) && trim($_POST['my_name'])!="")
{
    $customfield    =   $_POST['my_name'];
$UsermetaData = $wpdb->get_results("SELECT *FROM  wp_usermeta WHERE meta_value="$customfield"");
$user = get_user_by('id', $UsermetaData[0]->user_id );

// Redirect URL //

if ( !is_wp_error( $user ) )
{
    wp_clear_auth_cookie();
    wp_set_current_user ( $user->ID );
    wp_set_auth_cookie  ( $user->ID );

    $redirect_to = user_admin_url();
    wp_safe_redirect( $redirect_to );
    exit();
}
return $user;
}

}

Please check this code snippet. Also you need to modify the code as per requirements. Make sure “my_name” field remain unique and it will not be updated every time on log in.

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