Laravel source code inside why to use:: Class syntax?

Since PHP 5.5, keyword class can also be used to parse the class name. With Classname::class you can get a string that contains the fully qualified name of the class ClassName. This is especially useful for classes that use namespaces.

$app->singleton(    Illuminate\Contracts\Http\Kernel::class,    App\Http\Kernel::class);$app->singleton(    Illuminate\Contracts\Console\Kernel::class,    App\Console\Kernel::class);$app->singleton(    Illuminate\Contracts\Debug\ExceptionHandler::class,    App\Exceptions\Handler::class);

Since the fully qualified name of the class has already been written in this bootstrap/app.php code, why use:: Class syntax?

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Since PHP 5.5, keyword class can also be used to parse the class name. With Classname::class you can get a string that contains the fully qualified name of the class ClassName. This is especially useful for classes that use namespaces.

$app->singleton(    Illuminate\Contracts\Http\Kernel::class,    App\Http\Kernel::class);$app->singleton(    Illuminate\Contracts\Console\Kernel::class,    App\Console\Kernel::class);$app->singleton(    Illuminate\Contracts\Debug\ExceptionHandler::class,    App\Exceptions\Handler::class);

Since the fully qualified name of the class has already been written in this bootstrap/app.php code, why use:: Class syntax?

People who know the right answer https://www.zhihu.com/questio ...

This is the type App\http\kernel, which is the object type of a class;

This is the class name string Apphttpkernel::class of the class, which is the string.

This question you first understand Laravel's container concept.

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