change wordpress login page code example

Example 1: Change WordPress Login Logo Url

/* Change WordPress Login Logo Url */
function alter_login_logo_url() {
    return home_url();
}
add_filter( 'login_headerurl', 'alter_login_logo_url' );

Example 2: wordpress set custom login page

<?php
   
   /* Template Name: login-new */ 
   do_action('user_redirect_if_logged_in');

   // get_header();
   $login = home_url()."/login-new/";
   $dashboard = home_url()."/dashboard/";
   
   if(isset($_REQUEST['signin'])){
      $email = $_POST['email'];
      $password = $_POST['password'];
      $creds = array();
      $creds['user_login'] = $_POST['email'];
      $creds['user_password'] = $_POST['password'];
      $creds['remember'] = false;
      $user = wp_signon( $creds, false );
      //if ( is_wp_error($user) )
      //{
      //   header("location:$login");
      //}
      //else
      //{
      //   header("location:$dashboard");
      //} 

      $user = wp_signon( $creds);

      if(isset($user->errors)){
      // if(is_wp_error($user)) {
         echo $user->get_error_message();
         die;
      }else{ //successfully logged in
            session_start();  //check for wp_session storage 
            $_SESSION["new_dashboard"] = '1';  //if you want to redirect user to a new page or set any conditions on login
         
                if ($user->is_admin == '1') {
                  $dashboard = home_url()."/?page=old-dashboard";
                } else {
                  $dashboard = home_url()."/?page=new-dashboard";
                }
        
        //set cookie for remember me //save user login details as cookie if remember me is set, so that if user logs out next time and comes to this log in page, username & password auto fills by checking
        $user_login_details = $email.'_pass_'.$password;
        if(!empty($_POST["remember"])) {
          setcookie ("user_login_details",$user_login_details,time()+ (10 * 365 * 24 * 60 * 60)); //set cookie time as per you need
        } else {  //remove login details from cookie
          if(isset($_COOKIE["user_login_details"])) {
            setcookie ("user_login_details","");
          }
        }
         wp_redirect($dashboard);
         exit;
      }
   }
   
   if(isset($_COOKIE["user_login_details"])) {
          $login_details = $_COOKIE["user_login_details"];
          $login_details = explode('_pass_', $login_details);
          $email_set = $login_details[0];
          $pass_set = $login_details[1];
   }

   ?>

<!DOCTYPE html>
<html lang="en">

<head>
<?php 
   global $wpdb;
   $db_name = $wpdb->dbname;
?>

   <title>Sign In</title>

</head>

<title>New Login</title>

<div class="container-fluid">
   <div class="row">
      <div class="col-md-4 card-body">
     
         <div class="card">
            <div class="card-body">
             
               <h3 class="h3">Login</h3>

               <form method="POST" action="">                  
                  <div class="form-group">
                     <label>Email address</label>
                     <div class="input-group">
                        <input id="email" type="email" class="form-control" name="email" value="<?php if(isset($email_set)){ echo $email_set; } ?>" required />
                     </div>
                  </div>
                  <div class="form-group">
                  
                           <label class="form-control-label">Password</label>
                    
                           <a href="<?php echo site_url(); ?>/password-reset/" class="small text-muted text-underline--dashed border-primary">Lost password?</a>
                  
                     <div class="input-group input-group-merge">
             
                        <input id="password" type="password" value="<?php if(isset($pass_set)){ echo $pass_set; } ?>" class="form-control" name="password" required />
                        
                           <a href="#/" onClick="show_pass()" class="primary_color">
                           <i  class="fas fa-eye"></i>
                           </a>
                     </div>
                   
                           <input type="checkbox" name="remember" class="custom-control-input" id="remember" >
                           <label class="custom-control-label" for="remember">Remember Me</label>
                      
                        <button type="submit" id="signin" name="signin">
                        
                        </button>
                
                  </div>
               </form>
               
            </div>
         </div>
      </div>
   </div>
</div>
<script>
function show_pass() {
  var x = document.getElementById("password");
  if (x.type === "password") {
    x.type = "text";
  } else {
    x.type = "password";
  }
}
</script>

<?php get_footer();?>

Example 3: wordpress set two login url links

<?php
//if you want to show two (different) login pages for two (different) links,
//you can first of all think of two urls for two different login pages.
//here, i have two links =>  /login-old  and  /login-new for which i want different forms,
//now as any of these url hits the browser, i will check for url paramenter 

	$url = 'http://' . $_SERVER['SERVER_NAME'] . $_SERVER['REQUEST_URI'];

	if (strpos($url,'login-new') !== false) {
	    // echo 'to New Login page';
	    $cookie_name = "login_page";
		$cookie_value = "new";
		setcookie($cookie_name, $cookie_value, time() + (86400 * 30), "/"); //will not set immediately, but useful later for logout
    	header("Location: ".site_url('login'));  //this will be your default  login page url
		exit;
      
	} else if(strpos($url,'login-old') !== false) {
    	// echo 'to Old Login page';
	    $cookie_name = "login_page";
		$cookie_value = "old";
		setcookie($cookie_name, $cookie_value, time() + (86400 * 30), "/"); //will not set immediately, but useful later for logout
    	header("Location: ".site_url('login'));  
		exit;
    }

//now that the cookie is set, i know which form to show to user,   
//now, as the user gets redirected to default login page, go to it's template file
//and check for the default login form, where, check,

$login_page = '';
if (isset($_COOKIE['login_page'])) {
	$login_page = $_COOKIE['login_page'];
}

if ($login_page == 'new') {  ?>
  <style>
  #your new form styling here...
  </style>
<?php } else if ($login_page == 'old'){ ?>
  <style>
  #your old form styling here...
  </style>
<?php }

if ($login_page == 'new') { ?>
  <form id="new_form" action="" method="post"> </form>
<?php } else if ($login_page == 'old'){ ?>
  <form id="old_form" action="" method="post"> </form>
<?php } 
//here, check the default login form action attr to put above in our custom forms

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