wp_postmeta store multiple values in one key [closed]

If I follow you correctly you want an array of arrays.

$get_ref = $_SERVER['HTTP_REFERER'];
$ref = get_post_meta($post->ID, 'page_ref', true );
$ref[] = array($get_ref); //or $ref[][] = 'xyz' ...if you prefer
update_post_meta($post->ID,'page_ref', $ref);

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