I have a custom field who's content I would like to output as a ul list.

The custom field contains words that are separated with a spaces between.

I'm trying to use this code here but it's not working.

    $list_items = get_post_meta($post->ID, 'idid');

            $list_items = explode(" ", $list_items) {
                echo '<ul>';
                    foreach($list_items as $list_item)
                        echo '<li>' . $list_item . '</li>';
                echo '</ul>';


You are using get_post_meta incorrectly. As you use it, it will return an array - you cannot explode an array. See the codex on get_post_meta();

If you pass true as the third parameter, this tells the function to return a string. So,

$list_items = get_post_meta($post->ID, 'idid', true);

should work.

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