PHP Automatic Loading class Usage example analysis, PHP loading example Analysis _php Tutorial

PHP Automatic Loading class Usage example analysis, PHP loading example analysis

This example describes the PHP automatic loading class usage. Share to everyone for your reference, as follows:

<?php//function __autoload ($class _name) {//  require_once $class _name. '. php ';//}spl_autoload_register ("core", ' autoload '));//When instantiating a class, automatically call the AutoLoad () method in the core class to load the class///You can also use __ AutoLoad (), but the new version of PHP is recommended to use Spl_autoload_register, because __autoload () is gradually discarded $obj = new MyClass1 (); $obj 2 = new MyClass2 (); Class core{public  static function AutoLoad ($class) {    require $class. php ';  }}

Understanding ideas is the key:

Automatically load objects

Many developers write object-oriented applications to create a PHP source file for each class definition. A big annoyance is having to write a long list of included files (one file per class) at the beginning of each script.

In PHP 5, this is no longer necessary. You can define a __autoload () function that will be called automatically when you try to use a class that is not already defined. By calling this function, the scripting engine has the last chance to load the required classes before PHP fails.

Tip

Spl_autoload_register () provides a more flexible way to implement automatic loading of classes. Therefore, it is no longer recommended to use the __autoload () function, which may be deprecated in later versions.

More readers interested in PHP related content can view the topic: "PHP Primer for Object-oriented programming", "PHP Math Skills Summary", "PHP operation Office Document Skills Summary (including word,excel,access,ppt)", "PHP Array ( Array), "PHP Data structure and algorithm tutorial", "PHP Programming Algorithm Summary", "PHP Regular Expression Usage Summary", and "PHP Common database Operation Skills Summary"

I hope this article is helpful to you in PHP programming.

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