Fix aliases when used with preloader

[pbojan]

The opcache preloader is not a fan of the class_alias:

nginx_1          | 2022/01/25 14:56:10 [error] 25#25: *119 FastCGI sent in stderr: "PHP message: PHP Warning:  Cannot declare interface Assetic\Asset\AssetInterface, because the name is already in use in /www/foe/libs/external/assetic/framework/src/aliasing.php on line 17PHP message: PHP Warning:  Cannot declare interface Assetic\Asset\AssetCollectionInterface, because the name is already in use in /www/foe/libs/external/assetic/framework/src/aliasing.php on line 22PHP message: PHP Warning:  Cannot declare interface Assetic\Cache\CacheInterface, because the name is already in use in /www/foe/libs/external/assetic/framework/src/aliasing.php on line 27PHP message: PHP Warning:  Cannot declare interface Assetic\Exception\Exception, because the name is already in use in /www/foe/libs/external/assetic/framework/src/aliasing.php on line 32PHP message: PHP Warning:  Cannot declare interface Assetic\Factory\Loader\FormulaLoaderInterface, because the name is already in use in /www/foe/libs/external/assetic/framework/src/aliasing.php on line 37PHP message: PHP Warning:  Cannot declare interface Assetic\Resource\IteratorResourceInterface, because the name is already in use in /www/foe/libs/external/assetic/framework/src/aliasing.php on line 42PHP message: PHP Warning:  Cannot declare interface Assetic\Resource\ResourceInterface, because the name is already in use in /www/foe/libs/external/assetic/framework/src/aliasing.php on line 47PHP message: PHP Warning:  Cannot declare interface Assetic\Worker\WorkerInterface, because the name is already in use in /www/foe/libs/external/assetic/framework/src/aliasing.php on line 52PHP message: PHP Warning:  Cannot declare interface Assetic\Filter\DependencyExtractorInterface, because the name is already in use in /www/foe/libs/external/assetic/framework/src/aliasing.php on line 57PHP message: PHP Warning:  Cannot declare interface Assetic\Filter\FilterInterface, because the name is already in use in /www/foe/libs/external/assetic/framework/src/aliasing.php on line 62PHP message: PHP Warning:  Cannot dec

[jaxwilko]

A better option might be just asking opcache if the file has been cached.

if (function_exists('opcache_is_script_cached') && opcache_is_script_cached(__FILE__)) {
    return;
}

But the current changes should work and this way it'll stop the any issues caused by the file being required multiple times.

[jaxwilko]

Btw the failing test is unrelated to this change and patched in #28

[pbojan]

Thank you for the quick reviews! Do you require any action from my-side or you can merge the PR after #28 is merged?

[jaxwilko]

@pbojan no problem :). The's no conflicts between the 2 PRs so no action required on your side, thanks for raising this PR!