Note 019 automatic loading via Spl_autoload_register

Spl_autoload_register

(PHP 5 >= 5.1.2, PHP 7)

spl_autoload_register-registering a given function as an implementation of the __autoload

Grammar

BOOL Spl_autoload_register ([Callable $autoload _function [, bool $throw = True [, bool $prepend = false]]])

Description

With this function, you can specify the addressing method for the loaded class so that you do not have to require and include in large batches. The system will automatically follow the specified rules to the corresponding location to find the class that needs to be instantiated. Although this method is relatively low-level, in the case of a framework, we generally do not need to do this work. But inevitably there is a time to use, such as when I write this blog, I need to churn script, this time, will not open. The following example is a simple auto-loading program that I want to use in my script.

Example

Spl_autoload_register (function ($class) {    $rootPath = Realpath (sprintf ('%s/. ', __dir__));    $paths = Array (        ' src ',    );    foreach ($paths as $path) {        if (is_file (            $file = $rootPath. Directory_separator. $path. Directory_separator. $class            . '. php '        ) {            include $file;            Break;}}    );

Note that the anonymous function is PHP 5.3 and above can be used, if found not to use, check your PHP version. I'm simply specifying all classes in my Src folder to look for, and the class name is exactly the same as the file name.

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