PHP之static

static是属于类本身的，是实例化对象所共有的

使用形式：

static $val;
static function func(){}

调用形式：

类名：：$val;
类名：：func();

<code><span><span><?php </span><span><span>class</span><span>sta</span>{</span><span>public</span><span>$temp</span> = <span>123</span>;
    <span>static</span><span>$type</span> = <span>100</span>;
    <span>static</span><span><span>function</span><span>stat</span><span>()</span>{</span><span>$me</span> = <span>new</span><span>self</span>;
        <span>//静态方法中不能使用this关键字</span><span>echo</span><span>'common val:'</span>.<span>$me</span>->temp.<span>""</span>;
        <span>echo</span><span>'static val:'</span>.sta::<span>$type</span>.<span>"<hr>"</span>;
        <span>echo</span><span>'static val:'</span>.<span>$me</span>::<span>$type</span>.<span>"<hr>"</span>;
        <span>//静态方法中亦不可调用普通方法</span>
    }
}

<span>echo</span><span>'sta:'</span>.sta::<span>$type</span>.<span>""</span>;
<span>echo</span> sta::stat();

<span>$a</span> = <span>new</span> sta();
<span>echo</span><span>'a:'</span>.<span>$a</span>::<span>$type</span>.<span>""</span>;

<span>$b</span> = <span>new</span> sta();
<span>$a</span>::<span>$type</span> = <span>200</span>;
<span>echo</span><span>'b:'</span>.<span>$b</span>::<span>$type</span>.<span>""</span>;</span></span></code>

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