在 PHP 7.4 中，针对 URI ，基于 league/uri 添加查询参数

1、在 Laravel 6 中，基于判断字符串中是否包含 ?，有一个简单的实现

use Illuminate\Support\Str;

if (Str::contains($themeAwareUrlPath, '?')) {
 $suffix = '&';
} else {
 $suffix = '?';
}

return new HtmlString($prefix.$themeAwareUrlPath.$suffix.'d='.config('app.url'));

2、不过此实现，一些复杂的 URI 未考虑到。例：?d=3&e=5#6，会被替换为：?d=3&e=5#6&d=https://xxx.com 。

3、最终决定基于 league/uri 添加查询参数，执行 composer require league/uri-components、composer require league/uri

4、代码实现如下

use League\Uri\Uri;
use League\Uri\UriModifier;

$uri = Uri::createFromString($themeAwareUrlPath);
$cdnUri = UriModifier::mergeQuery($uri, 'd=' . config('app.url'));

return new HtmlString($prefix . $cdnUri->jsonSerialize());

5、基于一些常见的 URI ，替换后的结果如下，符合预期

$themeAwareUrlPath = '9919b10c-9217-44eb-8488-198a321067cc/assets/images/default-banner.64bbdd.jpg';

$themeAwareUrlPath .= '?a=3';
string(102) "9919b10c-9217-44eb-8488-198a321067cc/assets/images/default-banner.64bbdd.jpg?a=3&d=https://xxx.local"

$themeAwareUrlPath .= '?d=3';
string(98) "9919b10c-9217-44eb-8488-198a321067cc/assets/images/default-banner.64bbdd.jpg?d=https://xxx.local"

$themeAwareUrlPath .= '?d=3&e=5#6';
string(104) "9919b10c-9217-44eb-8488-198a321067cc/assets/images/default-banner.64bbdd.jpg?d=https://xxx.local&e=5#6"

$themeAwareUrlPath .= '?a=1&d=3&e=5#6';
string(108) "9919b10c-9217-44eb-8488-198a321067cc/assets/images/default-banner.64bbdd.jpg?a=1&d=https://xxx.local&e=5#6"

$themeAwareUrlPath .= '?#';
string(100) "9919b10c-9217-44eb-8488-198a321067cc/assets/images/default-banner.64bbdd.jpg?&d=https://xxx.local#"

$themeAwareUrlPath .= '?';
string(99) "9919b10c-9217-44eb-8488-198a321067cc/assets/images/default-banner.64bbdd.jpg?&d=https://xxx.local"