While writing object-oriented programming we have to include class files to call the method of the classes.
Sometimes we have to include a long list of needed includes (one for each class) at the beginning of each script.
Now, in PHP5 there is no longer necessary to includes classes. In PHP5 the spl_autoload_register function registers any number of autoloaders , enabling for classes and interfaces to be automatically loaded if they are not defined, PHP is given a last chance to load the class before throwing error.
include $classname . '.php';
$object2 = new Class2();
In the above example we do not need to include class1.php and class2.php . spl_autoload_register() function will automatically load class1.php and class2.php .
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