一个类可以在php中保持静态[重复]

Question

Possible Duplicate:
Is it possible to create static classes in PHP (like in C#)?

Can any one tell me if a php class can be declared as static ?

static class StaticClass
{
    public static function staticMethod()
    {
        return 'foo';
    }
}

This code giving me error.parse error: parse error, expecting `T_VARIABLE'

Answer 1

No, you can't explicitly declare a PHP class as static.

You can make its constructor private so attempting to instantiate it (at least from outside the class) causes fatal errors.

class StaticClass
{
    private function __construct() {}

    public static function staticMethod()
    {
        return 'foo';
    }
}

// Fatal error: Call to private StaticClass::__construct() from invalid context
new StaticClass();

If you're looking to implement static initialization and other features found in C# static classes, see the other linked question. Otherwise if all you want is to group some utility methods into a class, simply privatizing the constructor should do the trick.