将一个类赋值的问题

WBOY
Release: 2016-06-23 14:03:48
Original
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定义了一个类

class myclass{   function test()      echo "good";}$test1="myclass";$test2=new myclass();
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都是把类赋值给变量,那这两种赋值方法有什么差别?


回复讨论(解决方案)

你分??出那???量就知道啦

$test1只是字符串
$test2是类的实例,是个对象
对两者gettype()可以看出区别

<?phpclass MyClassq{    const constant = 'constant value';    function showConstant() {        echo  self::constant . "\n";    }}echo MyClassq::constant . "\n";$classname = "MyClassq";echo $classname::constant . "\n"; // PHP 5.3.0之后$class = new MyClassq();$class->showConstant();echo $class::constant."\n"; // PHP 5.3.0之后?> 
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上面说的$test1 的确是字符串,echo $classname::constant . "\n";为什么能访问到类里面的内容?

复习一下“变量的变量”

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