<?php
 
 namespace Illuminate\Contracts\Config;
 
 interface Repository
 {
     /**
      * Determine if the given configuration value exists.
      *
      * @param  string  $key
      * @return bool
      */
     public function has($key);
 
     /**
      * Get the specified configuration value.
      *
      * @param  array|string  $key
      * @param  mixed   $default
      * @return mixed
      */
     public function get($key, $default = null);
 
     /**
      * Get all of the configuration items for the application.
      *
      * @return array
      */
     public function all();
 
     /**
      * Set a given configuration value.
      *
      * @param  array|string  $key
      * @param  mixed   $value
      * @return void
      */
     public function set($key, $value = null);
 
     /**
      * Prepend a value onto an array configuration value.
      *
      * @param  string  $key
      * @param  mixed  $value
      * @return void
      */
     public function prepend($key, $value);
 
     /**
      * Push a value onto an array configuration value.
      *
      * @param  string  $key
      * @param  mixed  $value
      * @return void
      */
     public function push($key, $value);
 }