PHP Automatic loading

There are two ways to load PHP automatically.

The first scheme uses __autoload, the function is simpler and weaker.

However, one problem is not solved, that is, before the include to determine the existence of the problem of the file.

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set_include_path(‘aa‘. PATH_SEPARATOR . get_include_path());function__autoload($className){    //如果加这个检测, 因为此文件不在当前目录下,它就会检测不到文件存在,    //但include是能成功的    if(file_exists($className. ‘.php‘)) { 　　include_once($className. ‘.php‘);    } else{        exit(‘no file‘);    }}$a= newAcls();

The second scenario is automatically loaded with SPL, which is specifically stated here.

Spl_autoload_register ()

A simple example

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set_include_path ( ' AA '  < Code class= "PHP plain". Path_separator. Get_include_path ()); //function __autoload ($className) //{ //    if (file_exists ($className. '. php ') { //        include_once ($className . '. php '); //   } else { //         exit (' no file '); //   } //}  spl_autoload_register ();   $a  = new  acls ();

Spl_autoload_register () automatically calls Spl_autoload () in the path to find the ". PHP" program with a lowercase file name. The default lookup extension also has ". Ini" and can also be used with the Spl_autoload_ Extenstions () registers the extension.

You can also find a function by defining your own functions in the case of a clear condition that cannot be found.

Such as

function Loader1 ($class)

{

Write some code to load yourself

}

function Loader2 ($class)

{

When Loader1 () was not found, I came to find

}

Spl_autoload_register (' Loader1 ');

Spl_autoload_register (' Loader2 ');

You can have more ...

How the MVC framework implements automatic loading

Set the path First

' Include ' = = Array (' application/catalog/controllers ', ' application/catalog/models ',),

$include = Array (' application/controllers ', ' application/models ', ' application/library ');

Set_include_path (Get_include_path (). Path_separator. Implode (Path_separator, $config [' include ']);

After obtaining the URL, parse out the controller and method.

Then set the auto load

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classLoader{    /**     * 自动加载类     * @param $class 类名     */    publicstaticfunctionautoload($class)    {        $path= ‘‘;            $path = str_replace(‘_‘, ‘/‘, $class) . ‘.php‘;        include_once($path);    }} /** * sql自动加载 */spl_autoload_register(array(‘Loader‘, ‘autoload‘));

Route, instantiate the controller, call the method, and the thing you write begins to execute.

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/** * 路由 */publicfunctionroute(){    if(class_exists($this->getController())) {        $rc= newReflectionClass($this->getController());        if($rc->hasMethod($this->getAction())) {            $controller= $rc->newInstance();            $method= $rc->getMethod($this->getAction());            $method->invoke($controller);        } else            thrownewException(‘no action‘);    } else        thrownewException(‘no controller‘);}

1

1	初步的自动加载就完成了

PHP Automatic loading