尝试将此代码添加到函数中。php文件由提供TheDeadMedic:

function __filter_rewrite_rules( $rules )
{
    $_rules = array();
    foreach ( $rules as $rule => $rewrite )
        $_rules[ str_replace( \'attachment/\', \'media/\', $rule  ) ] = $rewrite;
    return $_rules;
}
add_filter( \'rewrite_rules_array\', \'__filter_rewrite_rules\' );

function __filter_attachment_link( $link )
{
    return preg_replace( \'#attachment/(.+)$#\', \'media/$1\', $link );
}
add_filter( \'attachment_link\', \'__filter_attachment_link\' );