这个可以有

namespace Illuminate\Container;

use Closure;
use ArrayAccess;
use ReflectionClass;
use ReflectionMethod;
use ReflectionFunction;
use ReflectionParameter;
use InvalidArgumentException;
use Illuminate\Contracts\Container\BindingResolutionException;
use Illuminate\Contracts\Container\Container as ContainerContract;
// namespace
class Container implements ArrayAccess, ContainerContract
{// Container implements ArrayAccess, ContainerContract
/**
* The current globally available container (if any).
*
* @var static
*/
protected static $instance;
// The current globally available container (if any);

/**
* An array of the types that have been resolved.
*
* @var array
*/
protected $resolved = [];// a resolved a array types
// An array of the types that have been resolved.

/**
* The container's bindings.
*
* @var array
*/
protected $bindings = [];// The container's bindings.
// a array use by bindings types

/**
* The container's shared instances.
*
* @var array
*/
protected $instances = [];
// The container's shared instances.
/**
* The registered type aliases.
*
* @var array
*/
protected $aliases = [];// The registered type aliases.

/**
* The extension closures for services.
*
* @var array
*/
protected $extenders = [];// The extension closures for services.

/**
* All of the registered tags.
*
* @var array
*/
protected $tags = [];// All of the registered tags.

/**
* The stack of concretions currently being built.
*
* @var array
*/
protected $buildStack = [];// The stack of concretions currently being built.

/**
* The contextual binding map.
*
* @var array
*/
public $contextual = [];//The contextual binding map.

/**
* All of the registered rebound callbacks.
*
* @var array
*/
protected $reboundCallbacks = [];// All of the registered rebound callbacks.

/**
* All of the global resolving callbacks.
*
* @var array
*/
protected $globalResolvingCallbacks = [];// All of the global callbacks.

/**
* All of the global after resolving callbacks.
*
* @var array
*/
protected $globalAfterResolvingCallbacks = [];
// All of the global after resolving callbacks.
/**
* All of the after resolving callbacks by class type.
*
* @var array
*/
protected $resolvingCallbacks = [];
// All of the after resolving callbacks by class type.
/**
* All of the after resolving callbacks by class type.
*
* @var array
*/
protected $afterResolvingCallbacks = [];
//All of the after resolving callbacks by class type.
/**
* Define a contextual binding.
*
* @param  string  $concrete
* @return \Illuminate\Contracts\Container\ContextualBindingBuilder
*/
public function when($concrete)
{
$concrete = $this->normalize($concrete);// get a normal ize()

return new ContextualBindingBuilder($this, $concrete);// return a function
}// Define a contextual binding