php中的var宣言的作用
php中的var声明的作用？
刚学不久的PHP，但即使《PHP圣经》涉及知识面很广的教材也没有提到PHP可以用var声明变量，但看网络上的一书类，用到了VAR来声明变明。如：
class test{
var $a;
var $b;
......
}
我测试了一上，好像var只能在类中使用，如果类以外使用会出错（PHP5.3）。
目前所能总结的也就这点了，哪位能系统讲一下这个关键字的其它作用？
------解决方案--------------------
PHP5中public就等同于var了
只是为了兼容PHP4，所以还保留var
------解决方案--------------------
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