PHP7之匿名類別 php7.0 php7 編譯安裝 apache php7.0 配置

匿名類別跟匿名函數一樣，創建一次性的簡單物件

<code><span><span><span><?php </span>
/**
 * Created by PhpStorm.
 * User: bee
 * Date: 2016/4/24
 * Time: 00:17
 */</span><span>echo</span><span>'匿名函数'</span>;
<span>$anonymous_func</span> = <span><span>function</span><span>()</span>{</span><span>return</span><span>'function'</span>;};
<span>echo</span><span>$anonymous_func</span>();
<span>echo</span><span>'<br>'</span>;
<span>echo</span><span>'<hr>'</span>;
<span><span>class</span><span>common</span> {</span><span>public</span><span>$default</span> = <span>10</span>;
    <span><span>function</span><span>__construct</span><span>(<span>$key</span>)</span>{</span><span>$this</span>->getVal(<span>$key</span>);
    }
    <span>public</span><span><span>function</span><span>getVal</span><span>(int <span>$i</span>)</span>:<span>int</span>{</span><span>$this</span>-><span>default</span> += <span>$i</span>;
        <span>return</span><span>$this</span>-><span>default</span>+<span>0.1</span>;
    }
}
<span>echo</span><span>'有名函数'</span>;<span>echo</span><span>'<br>'</span>;
<span>$com</span> = <span>new</span> common(<span>1</span>);

<span>echo</span><span>$com</span>->getVal(<span>2.2</span>).<span>'--'</span>;
<span>echo</span><span>$com</span>->getVal(<span>2.2</span>).<span>'--'</span>;

<span>echo</span> (<span>new</span> common(<span>1</span>))->getVal(<span>8.9</span>);
<span>echo</span><span>'<hr>'</span>;<span>echo</span><span>'匿名类'</span>;
<span>//定义匿名类需继承</span><span>echo</span> (<span>new</span><span><span>class</span>(1) <span>extends</span><span>common</span>{</span>})->getVal(<span>90</span>);<span>echo</span><span>'<br>'</span>;
<span>echo</span> (<span>new</span><span><span>class</span>(2) <span>extends</span><span>common</span>{</span>})->getVal(<span>90</span>);</span></span></code>

匿名類別被嵌套進普通 Class 後，不能存取這個外部類別（Outer class）的
private（私有）、protected（受保護）方法或屬性。 為了存取外部類別（Outer class）protected
屬性或方法，匿名類別可以 extend（擴充）此外部類別。 為了使用外部類別（Outer class）的 private
屬性，必須透過建構器傳進來：

<code><?php <span><span>class</span><span>Outer</span>
{<span>private</span> $prop = <span>1</span>;
    <span>protected</span> $prop2 = <span>2</span>;

    <span>protected</span> function func1()
    {
        <span>return</span><span>3</span>;
    }

    <span>public</span> function func2()
    {
        <span>return</span><span>new</span><span><span>class</span>($<span>this</span>-><span>prop</span>) <span><span>extends</span></span><span>Outer</span> {</span><span>private</span> $prop3;

            <span>public</span> function __construct($prop)
            {
                $<span>this</span>->prop3 = $prop;
            }

            <span>public</span> function func3()
            {
                <span>return</span> $<span>this</span>->prop2 + $<span>this</span>->prop3 + $<span>this</span>->func1();
            }
        };
    }
}

echo (<span>new</span> Outer)->func2()->func3();<span>//6</span></code>

匿名函數可以實現閉包，那麼對應的匿名類別也可以實現閉包

<code><span><?php </span><span>/**
 * Created by PhpStorm.
 * User: bee
 * Date: 2016/4/24
 * Time: 1:51
 */</span><span>$arr</span> = <span>array</span>();
<span>for</span> (<span>$i</span>=<span>0</span>; <span>$i</span>3</span>; <span>$i</span>++){
    <span>$arr</span>[] = <span>new</span><span><span>class</span>{</span><span>public</span><span>$index</span>=<span>0</span>;
        <span><span>function</span><span>__construct</span><span>()</span>
        {</span><span>echo</span><span>'create'</span>;
        }

        <span>public</span><span><span>function</span><span>getVal</span><span>(<span>$index</span>)</span>{</span><span>$this</span>->index = <span>$index</span>;
            <span>echo</span><span>$this</span>->index;
        }
        <span>public</span><span><span>function</span><span>getIndex</span><span>()</span>{</span><span>echo</span><span>$this</span>->index;
        }
    };
}
<span>$arr</span>[<span>2</span>]->getVal(<span>2</span>);
<span>echo</span><span>'<br>'</span>;
var_dump(<span>$arr</span>[<span>1</span>]);
<span>$arr</span>[<span>1</span>]->getIndex();
</code>

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以上就介紹了PHP7之匿名類，包含了php7方面的內容，希望對PHP教學有興趣的朋友有幫助。