Config

1. Config is define at conf.json

2. An typical config

   {
       "key": //class identifier，if no "class" set below, "key" is the class name.
       {
           "class":"class_name", //Optional, class name
           "singleton":true,// Optional, singleton, default is false
           "pass_by_construct":true,//Optional, pass properties by construct, default is false
           "properties":  
           {
                "name1": "{tpl_key_1}/apis/", //{tpl_key_1} is a template variable, will be replace when IoCFactory load this config.
                "name2": "value",//set name2 as a constant
                "name3":"@key1" //set name3 as an instance of "key1"
           }
       },
       "key1":{
           ...
       }

3. Examples

   Config the class "Users" with conf.json.

   class Users{
   
   /**
    * @property({"default":"@default_db"}) $this->db will be inited as an instance of "default_db" by default.
    * @var PDO
    */
   public $db;
   
   /**
    * @property the dir for storing avatar files.
    */
   public $avatar_files;
   }

   And its config

   {
   "Users":{
       "properties": {
           "avatar_files": "/var/avatar_files/"
        }
   },
   "default_db":{
   "singleton":true, //Optional，we use singleton to share default_db in all requests.
   	"class":"PDO",    //Optional
   	"pass_by_construct":true, //Optional
   	"properties":{
           "dsn":"mysql:host=127.0.0.1;port=3306;dbname=test;charset=UTF8",
           "username":"test",
           "passwd":"test"
       }
   }
   }

   phprs create Users with the config, if no "Users" config, phprs use new Users() to create "Users". Here we config it, so：

   1. phprs create "Users" with ReflectionClass::newInstanceWithoutConstructor(__construct not called)，
   2. set avatar_files
   3. call __construct In this sample，$db is specified not in Users's config, so the default value @default_db is used, and '@' means it an instance.

4. Config phprs

   {
   "phprs\\Router": {
       "properties": {
           "export_apis":true //Enable output api documents, if true, visit http://your-host:port/apis/ to get documents
           //,"hooks":["MyHook1","MyHook2"] //Enable hooks
           //,"url_begin":1 // if url is "/abc/123", then 1st path node "/abc/" will be ignored.
       } 
   },
   "phprs\\Invoker": {
       "properties": {
           //"cache":"@invokeCache"  //cache result of apis(the apis with @cache)
       } 
   }
   /** if the property "cache" of phprs\\Invoker is set
   ,
   "invokeCache":{
   	"class":"phprs\\util\\RedisCache",
   	"singleton":true,
   	"properties":{
   		"serialize":true,
   		"host":"127.0.0.1",
   		"port":"6379"
   	}
   }*/
   
   /** 
   //db config sample, and ezphp(https://github.com/caoym/ezsql) can work with PDO simply
   ,"db":{
   	"singleton":true,
   	"class":"PDO",
   	"pass_by_construct":true,
   	"properties":{
   		"dsn":"mysql:host=127.0.0.1;dbname=xxxxxx;charset=UTF8",
   		"username":"xxxxxx",
   		"passwd":"xxxxxx"  		
   	}
   }*/

}

 ```