page-forgot-password.php

<?php
/**
 * Template Name: Forgot Password
 *
 * @link https://developer.wordpress.org/themes/basics/template-hierarchy/#search-result
 *
 * @package CalCoin
 */

get_header();

?>
<div class="row align-center">
	<div class="columns small-10">
		<img src="<?php echo get_stylesheet_directory_uri(); ?>/assets/img/login-logo.png">
	</div>
</div>
<div class="row">
	<div class="columns">
		<div class="card card-padded">
			<?php
    global $wpdb;

    $error = '';
    $success = '';

    // check if we're in reset form
    if( isset( $_POST['action'] ) && 'reset' == $_POST['action'] )
    {
        $email = trim($_POST['user_login']);

        if( empty( $email ) ) {
            $error = 'Enter a username or e-mail address.';
        } else if( ! is_email( $email )) {
            $error = 'Invalid username or e-mail address.';
        } else if( ! email_exists( $email ) ) {
            $error = 'There is no user registered with that email address.';
        } else {

            $random_password = wp_generate_password( 12, false );
            $user = get_user_by( 'email', $email );

            $update_user = wp_update_user( array (
                    'ID' => $user->ID,
                    'user_pass' => $random_password
                )
            );

            // if  update user return true then lets send user an email containing the new password
            if( $update_user ) {
                $to = $email;
                $subject = 'Your new password';
                $sender = get_option('name');

                $message = 'Your new password is: '.$random_password;

                $headers[] = 'MIME-Version: 1.0' . "\r\n";
                $headers[] = 'Content-type: text/html; charset=iso-8859-1' . "\r\n";
                $headers[] = "X-Mailer: PHP \r\n";
                $headers[] = 'From: '.$sender.' < '.$email.'>' . "\r\n";

                $mail = wp_mail( $to, $subject, $message, $headers );
                if( $mail )
                    $success = 'Check your email address for you new password.';

            } else {
                $error = 'Oops something went wrong updaing your account.';
            }

        }

        if( ! empty( $error ) )
            echo '<div class="message"><p class="error"><strong>ERROR:</strong> '. $error .'</p></div>';

        if( ! empty( $success ) )
            echo '<div class="error_login"><p class="success">'. $success .'</p></div>';
    }
?>
			<form class="reset-form" method="post">
	                <p>Please enter your username or email address. You will receive a link to create a new password via email.</p>
	                <label for="user_login">Username or E-mail:</label>
                    <?php $user_login = isset( $_POST['user_login'] ) ? $_POST['user_login'] : ''; ?>
                    <input type="text" name="user_login" id="user_login" value="<?php echo $user_login; ?>" />

                    <input type="hidden" name="action" value="reset" />
                    <input type="submit" value="Get New Password" class="button button-primary" id="submit" />

	        </form>
		</div>
	</div>
</div>

<?php

get_footer();