src/Collection/ArrayAccess.php
public function usort( \Closure $callback )
	{
		usort( $this->data, $callback );
		reset( $this->data );

		return $this;
	}
public function usort( \Closure $callback )
	{
		usort( $this->data, $callback );
		reset( $this->data );

		return $this;
	}
Provide a callback to use for sorting the data.

@param \Closure $callback The callback to be used.

@return $this