命名空间中的PHP自动加载 [英] PHP Autoloading in Namespaces

问题描述

我在命名空间中自动加载时遇到了一个小问题.如此处的PHP手册所示: http://us.php.net /manual/zh-CN/language.namespaces.rules.php ，您应该可以使用标准名称自动加载名称空间功能，例如\ glue \ common \ is_email().

我有一个函数spl_autoload_register(array($ import，"load"));在初始名称空间中，但是每当我尝试从初始名称空间调用\ glue \ common \ is_email()时，它都不会传递该自动加载函数，但是在使用新的is_email()(在类的上下文中)时，它将通过.我不明白，手册说我可以从完全限定的名称中自动加载，但我不能:.

这是我的代码:

namespace glue;

require_once 'import.php';

use glue\import as import;
use glue\core\router as router;

$import = new import();

spl_autoload_register(array($import, "load"));

/** Works and echos glue\router **/
$router = new router();

/** Don't do nothing **/
$cheese = \glue\common\is_email($email);

我也尝试了以下代码:

namespace glue;

require_once 'import.php';

use glue\import as import;
use glue\core\router as router;
use glue\common;

$import = new import();

spl_autoload_register(array($import, "load"));

/** Works and echos glue\router **/
$router = new router();

/** Don't do nothing **/
$cheese = common\is_email($email);

最后是这段代码:

namespace glue;

require_once 'import.php';

use glue\import as import;
use glue\core\router as router;
use glue\common\is_email as F;

$import = new import();

spl_autoload_register(array($import, "load"));

/** Works and echos glue\router **/
$router = new router();

/** Don't do nothing **/
$cheese = F($email);

解决方案

这是唯一正确的答案.

每个命名空间都需要有自己的spl_autoload_register()函数.

另外，在5.3中 spl_autoload_register()语法已更改:

spl_autoload_register(__NAMESPACE__ . "\\className::functionName"));

以下应能工作:

namespace glue;

require_once 'import.php';

use glue\import as import;
use glue\core\router as router;

$import = new import();

spl_autoload_register(__NAMESPACE__ . "\\$import::load"));

/** Works and echos glue\router **/
$router = new router();

/** Don't do nothing **/
$cheese = \glue\common\is_email($email);

---

这是一些有效的实时代码！

../WebPageConsolidator.inc.php中的

:

class WebPageConsolidator
{
    public function __construct() { echo "PHP 5.2 constructor.\n"; }
}

在test.php中:

<?php

namespace WebPage;

class MyAutoloader
{
    public static function load($className)
    {
        require '../' . __NAMESPACE__ . $className . '.inc.php';
    }
}

spl_autoload_register(__NAMESPACE__ . "\\MyAutoloader::load");

class Consolidator extends \WebpageConsolidator
{
    public function __construct()
    {
        echo "PHP 5.3 constructor.\n";

        parent::__construct();
    }
}

// Output: 
// PHP 5.3 constructor.
// PHP 5.2 constructor.

所以我知道它可行.

I have had a slight problem with autoloading in my namespace. As shown on the PHP manual here: http://us.php.net/manual/en/language.namespaces.rules.php you should be able to autoload namespace functions with a full qualified name e.g. \glue\common\is_email().

Thing is I have a function spl_autoload_register(array($import, "load")); within the initial namespace but whenever I try and call \glue\common\is_email() from the initial namespace it will not pass that autoload function but when using new is_email() (in the context of a class) it will. I don't get it the manual says I can autoload from fully qualified names but I can't :.

Here's my code:

namespace glue;

require_once 'import.php';

use glue\import as import;
use glue\core\router as router;

$import = new import();

spl_autoload_register(array($import, "load"));

/** Works and echos glue\router **/
$router = new router();

/** Don't do nothing **/
$cheese = \glue\common\is_email($email);

I also tried this code as well:

namespace glue;

require_once 'import.php';

use glue\import as import;
use glue\core\router as router;
use glue\common;

$import = new import();

spl_autoload_register(array($import, "load"));

/** Works and echos glue\router **/
$router = new router();

/** Don't do nothing **/
$cheese = common\is_email($email);

and finally this code:

namespace glue;

require_once 'import.php';

use glue\import as import;
use glue\core\router as router;
use glue\common\is_email as F;

$import = new import();

spl_autoload_register(array($import, "load"));

/** Works and echos glue\router **/
$router = new router();

/** Don't do nothing **/
$cheese = F($email);

解决方案

Here's the only right answer.

Every namespace needs its own spl_autoload_register() function.

also, spl_autoload_register() syntax changed in 5.3:

spl_autoload_register(__NAMESPACE__ . "\\className::functionName"));

The following should work:

namespace glue;

require_once 'import.php';

use glue\import as import;
use glue\core\router as router;

$import = new import();

spl_autoload_register(__NAMESPACE__ . "\\$import::load"));

/** Works and echos glue\router **/
$router = new router();

/** Don't do nothing **/
$cheese = \glue\common\is_email($email);

---

Here is some live code that Just works!

in ../WebPageConsolidator.inc.php:

class WebPageConsolidator
{
    public function __construct() { echo "PHP 5.2 constructor.\n"; }
}

in test.php:

<?php

namespace WebPage;

class MyAutoloader
{
    public static function load($className)
    {
        require '../' . __NAMESPACE__ . $className . '.inc.php';
    }
}

spl_autoload_register(__NAMESPACE__ . "\\MyAutoloader::load");

class Consolidator extends \WebpageConsolidator
{
    public function __construct()
    {
        echo "PHP 5.3 constructor.\n";

        parent::__construct();
    }
}

// Output: 
// PHP 5.3 constructor.
// PHP 5.2 constructor.

So I know it works.

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