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How to use namespace when php performs dynamic access (code)

Oct 25, 2018 pm 04:40 PM
Namespaces

本篇文章给大家带来的内容是关于php进行动态访问时命名空间如何使用(代码),有一定的参考价值,有需要的朋友可以参考一下,希望对你有所帮助。

受PHP自身的动态特征的影响,在动态访问元素时,必须使用完全限定名,所以在动态的类、函数或常量名称中,限定名称和完全限定名没有区别,都是按照完全限定名进行解析

<?php
namespace {

const con=0;
const test="test";
function foo(){
    echo &#39;foo in global&#39;."\n";
}
class A{
    static function foo(){
        echo &#39;foo in global\A&#39;."\n";
    }
}
}
namespace a\b{
const con = 1;
const test="a\b\\test";
function foo(){
    echo &#39;foo in a\b\foo&#39;."\n";
}
class A{
    static function foo(){
        echo &#39;foo in a\b\A&#39;."\n";
    }
}


$a=&#39;A&#39;;
$obj=new $a();
$obj->foo();
$a=&#39;\A&#39;;
$obj=new $a();
$obj->foo();
$a=&#39;a\b\A&#39;;
$obj=new $a();
$obj->foo();
$a=&#39;\a\b\A&#39;;
$obj=new $a();
$obj->foo();

$b="con";
echo constant($b)."\n";
$b="\con";
echo constant($b)."\n";
$b="a\b\con";
echo constant($b)."\n";
$b="\a\b\con";
echo constant($b)."\n";

$c="foo";
$c();
$c="\\foo";
$c();
$c="a\b\\foo";
$c();
$c="\\a\\b\\foo";
$c();
}
?>
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