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What does the function SPL autoload register do in PHP?
3 Answers. spl_autoload_register() allows you to register multiple functions (or static methods from your own Autoload class) that PHP will put into a stack/queue and call sequentially when a “new Class” is declared.
How to use spl_ autoload_ register()?
It will call each function with one argument: ‘UnloadedClass’ . Then after each function is called, it checks if the class exists yet. If it doesn’t it continues until it reaches the end of the list. If the class is never loaded, you will get a fatal error telling you that the class doesn’t exist.
What is spl_ autoload_ register?
The spl_autoload_register() method registers functions in its stack in the order that spl_autoload_register() was called, and subsequently if you want an autoload function to override previous autoload functions you will either need to unregister the previous ones or change the order of the autoload stack.
How spl_ autoload_ register works?
The function spl_autoload_register is called with parameter ‘autoload’. That makes the function autoload to be called whenever a class is not found. When a class is not found, then the function autoload is invoked with the faulty class name as its parameter, and that parameter is actually used in its third line.
What is autoload PHP?
PHP 5 introduced the magic function __autoload() which is automatically called when your code references a class or interface that hasn’t been loaded yet. The major drawback to the __autoload() function is that you can only provide one autoloader with it.
How does the SPL autoload register ( ) method work?
The spl_autoload_register() method registers functions in its stack in the order that spl_autoload_register() was called, and subsequently if you want an autoload function to override previous autoload functions you will either need to unregister the previous ones or change the order of the autoload stack.
Why do I need to register my autoload function in PHP?
If your code has an existing __autoload () function then this function must be explicitly registered on the __autoload queue. This is because spl_autoload_register () will effectively replace the engine cache for the __autoload () function by either spl_autoload () or spl_autoload_call () .
Which is faster SPL autoload or PHP autoload?
PHP (more exactly spl_autoload) does the rest for you and is even quicker than a semantically equal self-defined autoload function like this one: I compared them with the following setting: There are 10 folders, each having 10 subfolders, each having 10 subfolders, each containing 10 classes.
Where to put the SPL Register in PHP?
You can’t put the code there. You should add the SPL register after your class. If you wanted to register a function inside the Manage class you could do: However, as you demonstrated you can use an anonymous function. You don’t even need a class, so you can just do: