image-wordpress-meta-example.html

<link rel="image_src" href="رابط الصورة" />
<meta property="og:image" content="رابط الصورة" />

image-wordpress-meta-header.php

<?php 
  if (is_single()) : 
    if (has_post_thumbnail()) : 
      $img = wp_get_attachment_image_src( get_post_thumbnail_id($postid), "full" ); 
      $url = $img['0'];
	echo '<link rel="image_src" href="'.$url.'" />';
	echo '<meta property="og:image" content="'.$url.'" />';
    endif;
  endif;
  wp_reset_query(); 
?>