Question

I have now a function to make the size of the thumbnail:

if (function_exists('add_theme_support')) {
    add_theme_support('post-thumbnails');
    set_post_thumbnail_size(200,112);
}

I would like to make the value of title="" as the post title.

Answer 1

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the_post_thumbnail('medium', array('title' => strip_tags(get_the_title())));

or

echo get_the_post_thumbnail( $post->ID, 'post-thumbnail', array('title' => strip_tags(get_the_title())) );

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OBS: “Set Thumbnail” is now called “Featured Image” in the dashboard

enjoy it!