How to apply SOLID to this PHP class?

PHP
5 
<?php namespace Classes;

class Container
{
	/**
	 * An array that contains container's elements
	 * @var array
	 */
	private $container = [];

/**
 * An array that contains the instances created.
 * @var array
 */
private $instances = [];

/**
 * Add a new element in the container.
 * @param  string   $name 
 * @param  callable $callable
 * @throws \Exception
 */
public function bind($name, callable $callable)
{
	if (is_string($name)) {
		$this->container[$name] = $callable;
	} else {
		throw new \Exception('Containe: You have to provide a valid name in the bind method');
	}
}

/**
 * Resolve an element from container.
 * @param  string $name
 * @return object
 */
public function resolve($name)
{
	if (isset($this->container[$name])) {
		return call_user_func($this->container[$name]);
	} else {
		throw new \Exception('Container: The '. $name . ' was not found in the container');
	}
}

/**
 * Create instances of elements from container.
 * @param  string $name
 */
public function singleton($name) 
{
	$this->instances[$name] = $this->resolve($name);
}

/**
 * Use the required instance.
 * @param  string $name
 * @return object
 * @throws \Exception
 */
public function resolveSingleton($name)
{
	if (isset($this->instances[$name])) {
		return $this->instances[$name];
	} else {
		throw new \Exception('Container: The '. $name . ' instance  was not found in the container');
	}		
}

}

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