WordPress: Enable Email Address Login & Change Login Page Text

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Drop this code snippet into your theme’s functions.php file to enable user login with email address, and also change login page text to inform about this functionality.

// login with email
add_action('wp_authenticate','email_login');
function email_login($user_name) {
	$user = get_user_by('email', $user_name);
	if(!empty($user->user_login))
		$user_name = $user->user_login;
	return $user_name;
}

// Change 'Username' to 'Username or Email Address' on login page
add_filter( 'gettext', 'login_text' );
add_filter( 'ngettext', 'login_text' );
function login_text( $translated ) {
     $translated = str_ireplace(  'Username',  'Username or Email Address',  $translated );
     return $translated;
}

Login code via Bavota