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php命名空间的使用，同一个命名空间可以在多个文件中定义

php namespace的使用，直接打印出已经定义的命名空间

直接上代码，a.php , b.php, c.php , main.php

a.php

<?php
namespace A{
    class Person{
        public $name = 'ljl';
    }
}

b.php

<?php
namespace A{
    class Animal{
        public $name = 'dog';
    }
}
                                    

c.php

<?php
namespace A\Test;
class Test{
    public $name = 'test';
}
                                      
                                     

main.php

<?php
include "./a.php";
include "./b.php";
include "./c.php";
$a = new \A\Person();
var_dump($a);
 
$animal = new \A\Animal();
var_dump($animal);
 
 
$namespaces=array();
foreach(get_declared_classes() as $name) {
    if(preg_match_all("@[^\\\]+(?=\\\)@iU", $name, $matches)) {
        $matches = $matches[0];
        $parent =&$namespaces;
        while(count($matches)) {
            $match = array_shift($matches);
            if(!isset($parent[$match]) && count($matches))
                $parent[$match] = array();
            $parent =&$parent[$match];
 
        }
    }
}
 
print_r($namespaces);
                                                                                           
                                                                                           
                                                                                           
                                                                                          