类似的内容可能很有用：

function image_tag($html, $id, $alt, $title) {
    return preg_replace(array(
            \'/\'.str_replace(\'//\',\'//\',get_bloginfo(\'url\')).\'/i\',
            \'/s+width="d+"/i\',
            \'/s+height="d+"/i\',
            \'/alt=""/i\'
        ),
        array(
            \'\',
            \'\',
            \'\',
            \'alt="\' . $title . \'"\'
        ),
        $html);
}
add_filter(\'get_image_tag\', \'image_tag\', 0, 4);