Basic-shortcode-practise.php

<?php 

	/*
		Plugin Name: Industry Toolkit
		Plugin URI: http://www.bandevs.com
		Author: Rubel Hasan
		Author URI: http://www.facebook.com/rubel.hasan.3572
		Description: This plugin use for only this theme
		Version: 1.0
		Tag: Industry, Basic, Shortcode generator
	*/

	function google_map($atts, $content = null){
		$value = shortcode_atts(array(
			'width' => 600,
			'height' => 450,
			'title' => ''
		), $atts);

		if(is_user_logged_in()) {
			$map = '<iframe src="https://www.google.com/maps/embed?pb=!1m10!1m8!1m3!1d14577.424680201519!2d90.41723125000001!3d24.0185022!3m2!1i1024!2i768!4f13.1!5e0!3m2!1sen!2sbd!4v1526452491132" width="'.$value['width'].'" height="'.$value['height'].'" frameborder="0" allowfullscreen></iframe>';
		}else{
			echo "<h1>Please you need to login to view this content</h1>";
		}

		if(!empty($value['title']) && is_user_logged_in() ){
			$map .= ''.$value['title'].'';
		}else{
			echo  'You need to register';
		}
		return $map; 
	}
	add_shortcode('gmap','google_map'); 

?>