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system/vendor/illuminate/contracts/Config/Repository.php

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+<?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);
+}