4

I have created 5 folders containing 5 classes (Ad_Class, Blocked_Class, Friend_Class, Image_Class, Profile_Class) in the main directory. I also created the respective classes within the mentioned folders with the exact name as the folders. i.e. if folder name is Ad_Class then the class within the folder is also the same as the folder name as in "class Ad_Class.

In the index.php file I wrote the following code:

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;

After executing the above code I get the below warnings:

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

Why is this happening? Can anyone explain?

Update: I found the following code to work. If you have any suggestions please feel free to share!

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();

It produces the following: Advertising Blocked Friend Image

which is nothing more than displaying the class name of the instantiated object to see if the code worked correclty in loading classes.

4

1 回答 1

7

spl_autoload_register()堆栈，因此它将运行您为尝试创建的每个类定义的所有五个函数，无论它是哪个类。拿这个例子并重新设计它以满足您的需求：

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

检查文件is_file()将省去所有那些没有此类文件或目录警告的头痛。switch()根据您的文件路径布局，您可能需要使用声明或类似的东西扩展我给出的匿名函数示例。

于 2013-02-08T16:02:29.240 回答