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並前往https://wordpress.stackexchange.com/questions/253903/want-to-make-a-css-if-meta-key-value-is-empty

Want to make A CSS if meta key value is empty - WordPress ...

you won't need css for that // Create the widget output. public function widget( $args, $instance ) { $prod_image_url = get_post_meta( 'prod_image_url' ); ...

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