Parsing php class registration and automatic loading

This article provides a detailed analysis of php class registration and automatic loading. For more information, see The project directory is as follows:



1. Place the classes to be registered in an array.

The code is as follows:

Final class Utils {
Private function _ construct (){
}
Public static function getClasses ($ pre_path = '/'){
$ Classes = array (
'Dbconfig' => $ pre_path. 'dbconfig/DBConfig. php ',
'User' => $ pre_path. 'model/User. php ',
'Dao '=> $ pre_path. 'Dao/Dao. php ',
'Userdao '=> $ pre_path. 'Dao/UserDao. php ',
'Usermapper' => $ pre_path. 'ing ing/UserMapper. php ',
);
Return $ classes;
}
}
?>

2. register an array
Note:The class paths in step 1 are relative to init. php, not to Utils, because we use the automatic loading function spl_autoload_register in init. php to require the class.

The code is as follows:

Require_once '/Utils. php ';
Final class Init {

/**
* System config.
*/
Public function init (){
// Error reporting-all errors for development (ensure you have
// Display_errors = On in your php. ini file)
Error_reporting (E_ALL | E_STRICT );
Mb_internal_encoding ('utf-8 ');
// Registe classes
Spl_autoload_register (array ($ this, 'loadclass '));
}

/**
* Class loader.
*/
Public function loadClass ($ name ){
$ Classes = Utils: getClasses ();
If (! Array_key_exists ($ name, $ classes )){
Die ('class "'. $ name.'" not found .');
}
Require_once $ classes [$ name];
}
}
$ Init = new Init ();
$ Init-> init ();
?>

3. in this example, require init. php in test. php is used.

The code is as follows:

Require_once 'init. php ';
$ Dao = new UserDao ();
$ Result = $ dao-> findByName ('zcl ');
?>