TOC
php autoload
In general, when we use a file which not include in current file, we need to load it in current file by using require or include;
But when a project has a lot of php files, it is not a good way to include each file manually.
Let’s see a simple code:
<?php
$person = new Person("Rhys", 20);
var_dump($person);
There is a new class Person which didn’t be load in current file. In this case, php will call default autoload method spl_autoload() in order to load possible class;
In OPCODE file, it call FETCH_CLASS method. Refer to the source file, we found that it call autoload_func;
spl_autoload_call will try all registered __autoload() functions to load the requested class;
spl_autoload(): spl_autoload ( string $class_name [, string $file_extensions = spl_autoload_extensions() ] ) : void
The spl_autoload_register() function registers any number of autoloaders, enabling for classes and interfaces to be automatically loaded if they are currently not defined. By registering autoloaders, PHP is given a last chance to load the class or interface before it fails with an error.
REFERENCE: https://www.php.net/manual/en/language.oop5.autoload.php
https://segmentfault.com/a/1190000006188247
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