Use a variable inside get_post_thumbnail

  • I have custom post types, with custom meta fields.
    Used in a loop to list features on my homepage.

    Within the loop, I want to use a variable ($number) from one of my meta fields, to pull the feature image from a different post.

    EG: This works of course, getting the image from post no. 3778 :

    <?php echo get_the_post_thumbnail( 3778 , 'thumbnail' ); ?>

    but I need the number to be my variable, such as:

    <?php echo get_the_post_thumbnail( $number , 'thumbnail' ); ?>

    I’ve been at this for 2 days now… PLEASE HELP?!

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