Warning: implode() [function.implode]: Invalid arg

问题:

I'm getting the error below...

Warning: implode() [function.implode]: Invalid arguments passed in \wp-content/themes/mytheme/functions.php on line 1335

at...

function my_get_tags_sitemap(){
    if ( !function_exists('wp_tag_cloud') || get_option('cb2_noposttags')) return;
    $unlinkTags = get_option('cb2_unlinkTags'); 
    echo '<div class="tags"><h2>Tags</h2>';
    if($unlinkTags)
    {
        $tags = get_tags();
        foreach ($tags as $tag){
            $ret[]= $tag->name;
        }
        //ERROR OCCURS HERE
        echo implode(', ', $ret);
    }
    else
    {
        wp_tag_cloud('separator=, &smallest=11&largest=11');
    }
    echo '</div>';
}

Any ideas how to intercept the error. The site has exactly one tag.

回答1:

You are getting the error because $ret is not an array.

To get rid of the error, at the start of your function, define it with this line: $ret = array();

It appears that the get_tags() call is returning nothing, so the foreach is not run, which means that $ret isn't defined.

回答2:

You can try

echo implode(', ', (array)$ret);

回答3:

It happens when $ret hasn't been defined. The solution is simple. Right above $tags = get_tags();, add the following line:

$ret = array();