spl_autoload_register不工作

Question

我在主目录中创建了5个包含5个类(Ad_Class,Blocked_Class,Friend_Class,Image_Class,Profile_Class)的文件夹.我还在所提到的文件夹中创建了相应的类,并使用确切的名称作为文件夹.即,如果文件夹名称是Ad_Class,则文件夹中的类也与"类Ad_Class"中的文件夹名称相同.

在index.php文件中,我编写了以下代码:

function Ad_Class($name)
{
    include "Ad_Class/$name.php";
}
function Blocked_Class($name)
{
    include "Blocked_Class/$name.php";
}
function Friend_Class($name)
{
    include "Friend_Class/$name.php";
}
function Image_Class($name)
{
    include "Image_Class/$name.php";
}
function Profile_Class($name)
{
    include "Profile_Class/$name.php";
}

spl_autoload_register("Ad_Class");
spl_autoload_register("Blocked_Class");
spl_autoload_register("Friend_Class");
spl_autoload_register("Image_Class");
spl_autoload_register("Profile_Class");

$a = new Ad_Class;
$b = new Blocked_Class;
$c = new Blocked_Class;
$d = new Image_Class;
$e = new Profile_Class;

执行上面的代码后,我收到以下警告:

Warning: include(Ad_Class/Blocked_Class.php): failed to open stream: No such file or directory in C:\Users\Robert\Documents\web development\xampp\htdocs\xampp\web_development\development.php on line 4

Warning: include(): Failed opening 'Ad_Class/Blocked_Class.php' for inclusion (include_path='.;C:\Users\Robert\Documents\web development\xampp\php\PEAR') in C:\Users\Robert\Documents\web development\xampp\htdocs\xampp\web_development\development.php on line 4

Warning: include(Ad_Class/Image_Class.php): failed to open stream: No such file or directory in C:\Users\Robert\Documents\web development\xampp\htdocs\xampp\web_development\development.php on line 4

Warning: include(): Failed opening 'Ad_Class/Image_Class.php' for inclusion (include_path='.;C:\Users\Robert\Documents\web development\xampp\php\PEAR') in C:\Users\Robert\Documents\web development\xampp\htdocs\xampp\web_development\development.php on line 4

Warning: include(Blocked_Class/Image_Class.php): failed to open stream: No such file or directory in C:\Users\Robert\Documents\web development\xampp\htdocs\xampp\web_development\development.php on line 8

Warning: include(): Failed opening 'Blocked_Class/Image_Class.php' for inclusion (include_path='.;C:\Users\Robert\Documents\web development\xampp\php\PEAR') in C:\Users\Robert\Documents\web development\xampp\htdocs\xampp\web_development\development.php on line 8

Warning: include(Friend_Class/Image_Class.php): failed to open stream: No such file or directory in C:\Users\Robert\Documents\web development\xampp\htdocs\xampp\web_development\development.php on line 12

Warning: include(): Failed opening 'Friend_Class/Image_Class.php' for inclusion (include_path='.;C:\Users\Robert\Documents\web development\xampp\php\PEAR') in C:\Users\Robert\Documents\web development\xampp\htdocs\xampp\web_development\development.php on line 12

Warning: include(Ad_Class/Profile_Class.php): failed to open stream: No such file or directory in C:\Users\Robert\Documents\web development\xampp\htdocs\xampp\web_development\development.php on line 4

Warning: include(): Failed opening 'Ad_Class/Profile_Class.php' for inclusion (include_path='.;C:\Users\Robert\Documents\web development\xampp\php\PEAR') in C:\Users\Robert\Documents\web development\xampp\htdocs\xampp\web_development\development.php on line 4

Warning: include(Blocked_Class/Profile_Class.php): failed to open stream: No such file or directory in C:\Users\Robert\Documents\web development\xampp\htdocs\xampp\web_development\development.php on line 8

Warning: include(): Failed opening 'Blocked_Class/Profile_Class.php' for inclusion (include_path='.;C:\Users\Robert\Documents\web development\xampp\php\PEAR') in C:\Users\Robert\Documents\web development\xampp\htdocs\xampp\web_development\development.php on line 8

Warning: include(Friend_Class/Profile_Class.php): failed to open stream: No such file or directory in C:\Users\Robert\Documents\web development\xampp\htdocs\xampp\web_development\development.php on line 12

Warning: include(): Failed opening 'Friend_Class/Profile_Class.php' for inclusion (include_path='.;C:\Users\Robert\Documents\web development\xampp\php\PEAR') in C:\Users\Robert\Documents\web development\xampp\htdocs\xampp\web_development\development.php on line 12

Warning: include(Image_Class/Profile_Class.php): failed to open stream: No such file or directory in C:\Users\Robert\Documents\web development\xampp\htdocs\xampp\web_development\development.php on line 16

Warning: include(): Failed opening 'Image_Class/Profile_Class.php' for inclusion (include_path='.;C:\Users\Robert\Documents\web development\xampp\php\PEAR') in C:\Users\Robert\Documents\web development\xampp\htdocs\xampp\web_development\development.php on line 16

为什么会这样？谁能解释一下？

更新:我发现以下代码可以正常工作.如果您有任何建议,请随时分享!

function ad_class($class)
{
    if(!class_exists($class) && $class == "Ad_Class")
    {
        include "Ad_Class/$class" . ".php";
    }
    elseif(!class_exists($class))
    {
        return;
    }
}

function blocked_class($class)
{
    if(!class_exists($class) && $class == "Blocked_Class")
    {
        include "Blocked_Class/$class" . ".php";
    }
    elseif(!class_exists($class))
    {
        return;
    }
}

function friend_class($class)
{
    if(!class_exists($class) && $class == "Friend_Class")
        {
        include "Friend_Class/$class" . ".php";
    }
    elseif(!class_exists($class))
    {
        return;
    }
}

function image_class($class)
{
    if(!class_exists($class) && $class == "Image_Class")
    {
        include "Image_Class/$class" . ".php";
    }
    elseif(!class_exists($class))
    {
        return;
    }
}

function profile_class($class)
{
        if(!class_exists($class) && $class == "Profile_Class")
    {
        include "Profile_Class/$class" . ".php";
    }
    elseif(!class_exists($class))
    {
        return;
    }
}
spl_autoload_register("ad_class");
spl_autoload_register("blocked_class");
spl_autoload_register("friend_class");
spl_autoload_register("image_class");
spl_autoload_register("profile_class");

$a = new Ad_Class;
$a->ad();

$b = new Blocked_Class;
$b->block();

$c = new Friend_Class;
$c->fr();

$d = new Image_Class;
$d->image();

它产生以下内容:广告被阻止的朋友形象

这只不过是显示实例化对象的类名,以查看代码在加载类时是否正常工作.

Answer 1

spl_autoload_register()堆栈,因此它将为您尝试创建的每个类运行您已定义的所有五个函数,无论它是哪个类.以此为例,重新设计以满足您的需求:

spl_autoload_register( function($name) {
    if (is_file('/classes/'.$name.'.class.php')) {
        require_once('/classes/'.$name.'.class.php');
    }
});

检查文件is_file()将保存所有那些没有这样的文件或目录警告的头痛.根据您的文件路径布局,您可能需要展开我给出的匿名函数示例switch()或类似的语句.