heat_twitter_card.php

function heat_twitter_card(){

	$title = get_post_meta(get_queried_object_id(), 'Title', true);
        $description = get_post_meta(get_queried_object_id(), 'Description', true);
        $image = get_the_image(array('format'=>'array')); ?>


        <!--Twitter Card-->
        <meta name="twitter:card" content="summary">
        <meta name="twitter:site" content="@marcheatley">
        <meta name="twitter:title" content="<?php echo $title; ?>">
        <meta name="twitter:description" content="<?php echo $description; ?>">
        <meta name="twitter:creator" content="@marcheatley">
        <meta name="twitter:image:src" content="<?php echo $image[url]; ?>">

   <?php }

   add_action( 'wp_head', 'heat_twitter_card' );