PHP Singleton mode doubts

For example, below this class, this is the code that I used now:

  
   collection($_collection);        else return self::$_database;    }}?>

If I execute the code below, how many times is new Database? Is there a single-case effect?

$collection1 = Instance::Database('test1');$collection2 = Instance::Database('test2');$collection3 = Instance::Database('test3');

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For example, below this class, this is the code that I used now:

  
   collection($_collection);        else return self::$_database;    }}?>

If I execute the code below, how many times is new Database? Is there a single-case effect?

$collection1 = Instance::Database('test1');$collection2 = Instance::Database('test2');$collection3 = Instance::Database('test3');

You put an echo in front of new to debug it.

If you are not willing to do so, the answer is: only new once, then the call is if(self::$_database === NULL) false done, and will not be executed to new

Called once, and then new once.

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