以其为起点（未测试）：

/**
 * Limit links inside the content.
 * 
 * @param (string) $content
 * @return (string) $content
 */
function wpse30754_limit_content_links( $content )
{
    // delete all <a> tags in the post
    $content = preg_replace( "/<a[^>]*><\\\\/a[^>]*>/", \'\', $content );

    return $content;
}
add_filter( \'the_content\', \'wpse30754_limit_content_links\' );