PHP Autoloading Classes: Many developers writing object-oriented applications create one PHP source file per class definition. One of the biggest annoyances is having to write a long list of needed includes at the beginning of each script (one for each class).
In PHP 5, this is no longer necessary. 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.
Example #1 Autoload example
This example attempts to load the classes MyClass1 and MyClass2 from the files MyClass1.php and MyClass2.php respectively.
1 2 3 4 5 6 7 8 | <?php spl_autoload_register(function ($class_name) { include $class_name . '.php'; }); $obj = new MyClass1(); $obj2 = new MyClass2(); ?> |
Example #2 Autoload other example
This example attempts to load the interface ITest.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 | <?php spl_autoload_register(function ($name) { var_dump($name); }); class Foo implements ITest { } /* string(5) "ITest" Fatal error: Interface 'ITest' not found in ... */ ?> |
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