singleton - trying to initialise a static property on creation fails

Question

I have a singleton class used to initialise error_handling.

The class as is takes a Zend_Config object and optional $appMode in parameter, to allow overriding the def

Answer 1

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_errorConfig = $config;

   if(isset($appMode)){
       self::$_appMode = $appMode;
   }else{
         self::$_appMode = APPMODE;
   }  
 }

 private final function  __clone(){}

 public static function getInstance(array $config, $appMode = null){
     if(! (self::$instance instanceof self)){
         self::$instance = new ErrorHandling($config, $appMode);
     } 
     return self::$instance;
 }

 public static function getAppMode() {
    return self::$_appMode;
 }
} 

$e = ErrorHandling::getInstance(array('dev' => true), -255);
var_dump($e, ErrorHandling::getAppMode());

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Your could read here about difference between static and self- late static binding