.net - php如何实现C#那种类库的概念

<code>namespace MyTools;

class tool1
{

}

</code>

<code>namespace MyTools;

class tool2
{

}

</code>

<code>include MyTools\tool1;
include MyTools\tool2;

$t1 = new tool1();
$t2 = new tool2();

</code>

<code>include MyTools;

$t1 = new tool1();
$t2 = new tool2();
</code>

<code>namespace MyTools;

class tool1
{

}

</code>

<code>namespace MyTools;

class tool2
{

}

</code>

<code>include MyTools\tool1;
include MyTools\tool2;

$t1 = new tool1();
$t2 = new tool2();

</code>

<code>include MyTools;

$t1 = new tool1();
$t2 = new tool2();
</code>