91 php 命名空间1

1.使用命名空间：基础

<code><span><span><?php </span><span>namespace</span><span>Foo</span>;

<span><span>function</span><span>strlen</span><span>()</span> {</span><span>echo</span><span>'hello'</span>;
}
<span>const</span> INI_ALL = <span>3</span>;
<span><span>class</span><span>Exception</span> {</span>}

<span>$a</span> = strlen(<span>'hi'</span>); <span>// 调用命名空间 Foo 的strlen()</span><span>$aa</span> = \strlen(<span>'hi'</span>);<span>//调用全局函数strlen</span><span>$b</span> = \INI_ALL; <span>// 访问全局常量 INI_ALL</span><span>$c</span> = <span>new</span> \<span>Exception</span>(<span>'error'</span>); <span>// 实例化全局类 Exception</span><span>echo</span><span>$a</span> . <span>'<br>'</span>;
<span>echo</span><span>$aa</span> . <span>'<br>'</span>;
<span>echo</span><span>$b</span> . <span>'<br>'</span>;
<span>echo</span><span>$c</span> . <span>'<br>'</span>;
</span></span></code>

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