我想在PHP中创建一个静态类，并让它像在C#中一样运行，所以
这种事情...
static class Hello {
private static $greeting = 'Hello';
private __construct() {
$greeting .= ' There!';
}
public static greet(){
echo $greeting;
}
}
Hello::greet(); // Hello There!
你可以在PHP中使用静态类，但它们不会自动调用构造函数（如果你尝试调用，你会得到一个错误）。self::__construct()
因此，您必须创建一个函数并在每个方法中调用它：initialize()
<?php
class Hello
{
private static $greeting = 'Hello';
private static $initialized = false;
private static function initialize()
{
if (self::$initialized)
return;
self::$greeting .= ' There!';
self::$initialized = true;
}
public static function greet()
{
self::initialize();
echo self::$greeting;
}
}
Hello::greet(); // Hello There!
?>
除了 Greg 的答案之外，我还建议将构造函数设置为私有，以便无法实例化该类。
因此，在我看来，这是一个更完整的基于Greg的例子：
<?php
class Hello
{
/**
* Construct won't be called inside this class and is uncallable from
* the outside. This prevents instantiating this class.
* This is by purpose, because we want a static class.
*/
private function __construct() {}
private static $greeting = 'Hello';
private static $initialized = false;
private static function initialize()
{
if (self::$initialized)
return;
self::$greeting .= ' There!';
self::$initialized = true;
}
public static function greet()
{
self::initialize();
echo self::$greeting;
}
}
Hello::greet(); // Hello There!
?>
