Featured image

functions.php

<?php

// =========================================================================
// CUSTOM IMAGE SIZE
// =========================================================================
add_image_size( 'grid-img', 700, 368, true );

// =========================================================================
// FEATURED IMAGE INSIDE THE LOOP
// =========================================================================
function featured_image_card(){
	if ( has_post_thumbnail() ) {
		the_post_thumbnail( 'grid-img', array('class' => 'featured') );
	}
	else {
		echo '<img class="featured" src="' . get_bloginfo( 'stylesheet_directory' ) 
			. '/assets/images/placeholder.jpg" />';
	}
}