This is how to create custom widget

custom-widget.php

<?php

/*
*Creating custom widgets
*Check out the tuts: https://www.ministryofwp.com/build-custom-wordpress-widget/
*/

class mwp_wid extends WP_Widget{
	
	function mwp_wid(){
		parent::WP_Widget(false, $name = "MWP Test Widgets");
	}
	
	function form($instance){
		
		
		$name = esc_attr($instance['name']);
		?>
		
	    <p>

        <label for="<?php echo $this->get_field_id('name'); ?>"><?php _e('Your Name:'); ?></label>

        <input id="<?php echo $this->get_field_id('name'); ?>" name="<?php echo $this->get_field_name('name'); ?>" type="text" value="<?php echo $name; ?>" />

	    </p> 
		
		<?php
		
	}
	
	function update($new_instance,$old_instance){
		
		$instance = $old_instance;
		$instance['name'] = strip_tags($new_instance['name']);
		
		return $instance;
	}
	
	function widget($args, $instance) {
		
			extract( $args );

			// these are the widget options
			$name = $instance['name'];
			
			
			echo $before_widget;

			
			// Check if options are set
			
			if( $name ) {
				echo '<p class="wp_widget_plugin_textarea" style="font-size:25px;">'.$name.'</p>';
			}
			
			echo $after_widget; 
	}
	
}

add_action('widgets_init', create_function('', 'return register_widget("mwp_wid");'));