Home Backend Development PHP Tutorial 请教有没有人用过traits类型?有个有关问题需要问

请教有没有人用过traits类型?有个有关问题需要问

Jun 13, 2016 pm 12:54 PM
class counter nbsp static trait

请问有没有人用过traits类型?有个问题需要问

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<br />

<?php<br />

    trait Counter {<br />

        static $a = 5;<br />

        public function inc() {<br />

            static $c = 0;<br />

            $c += 1;<br />

            echo "$c<br />";<br />

        }<br />

    }<br />

    <br />

    class C1 {<br />

        use Counter;<br />

    }<br />

    <br />

    class C2 {<br />

        use Counter;<br />

    }<br />

    <br />

    <br />

    <br />

    $o = new C1();<br />

    $o->inc();<br />

    echo Counter::$a;<br />

    echo '<br />';<br />

    <br />

    $p = new C2();<br />

    $p->inc();<br />

?><br />

Copy after login


手册上讲“静态变量可以被 trait 的方法引用,但不能被 trait 定义。但是 traits 能够为使用的类定义静态方法”,但为什么我这个例子中的static $a = 5;又可以成功定义并最后成功输出?

class function php
------解决方案--------------------
trait 是 php 5.4 才加入的
你的手册是最新的吗?
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