Save array to post meta

For example, you need to save list of users, who entered each page or post:

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global $post, $current_user;
 
$data = unserialize(get_post_meta($post->ID, '_list', true));
 
if( count($data) != 0 ) {
 
    if ( !in_array( $current_user->ID, $data ) ) {
 
        $data[] = $current_user->ID;
 
    }
 
    $data = array_unique($data); // remove duplicates
 
    sort( $data ); // sort array
 
    //$data = serialize($data);
 
    update_post_meta($post->ID, '_list', $data);
 
} else {
 
    $data = array();
 
    $data[0] = $current_user->ID;
 
    //$data = serialize($data);
 
    update_post_meta($post->ID, '_list', $data); 
 
}

2 thoughts on “Save array to post meta”

  1. Great, this really helps!

    It doesn't work with the latest WordPress however. This line in both blocks isn't necessary:

    $data = serialize($data);

    In fact it will store a serialized string containing the serialized array in it. WordPress automatically serializes arrays when update_post_meta is called.

    Reply

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