Добавление поля в плагин WordPress

<?php  
	/* Testimonials  ---------------------------------------------*/ 
	 
	add_shortcode('testimonials', 'evont_testimonials'); 
	 
	function evont_testimonials($atts, $content = null) {  
		extract(shortcode_atts(array( 
				'post_count' => '', 
				'style' => '', 
				), $atts));  
		  
		 
		//initial variables 
		$out='';  
		$border=''; 
		 
 
		if ($style=='light'): 
		$text_style='jx-light'; 
		elseif($style=='dark'): 
		$text_style='jx-dark'; 
		endif; 
		 
		if ($border=='yes'): 
		$border='border'; 
		else: 
		$border=''; 
		endif; 
		 
		//initial variables 
		$out='';  
		 
		$out ='<div class="jx-evont-testimonials-1">'; 
		 
		$args = array('post_type' => 'testimonials','orderby' => 'date', 'order' => 'ASC','showposts' => $post_count );  
	 
	 
			$loop = new WP_Query( $args ); 		 
			while ( $loop->have_posts() ) : $loop->the_post();   
			 
			//function code 
				 
				$testimonial_jobposition = get_post_meta( get_the_ID(), 'jx_evont_testimonial_business_name', true ); 	 
				 
				 
				 
				$out .=' 
				<div class="col-sm-4"> 
					<div class="item"> 
						<div class="jx-evont-testimonial-details '.$border.'"> 
							<div class="icon"><img src="http://site.com/wp-content/uploads/2017/11/qute.png" alt=""></div> 
							<div class="description">'.get_the_content().'</div> 
							<div class="user_img"></div> 
							<div class="name">'. get_the_title() .'</div> 
							<div class="position">'.$testimonial_jobposition.'</div> 
						</div>	 
					</div> 
				</div> 
				'; 
				 
				 
							 
				endwhile; 
				 
				 
				$out .='</div>'; 
			 
			 
			 
			wp_reset_query();  
		 
		//return output 
		return $out; 
	}