<?php spl_autoload_register(function ($class) { if ('Foo' === $class) { class Foo implements Foointerface {} } elseif ('Foointerface' === $class) { throw new Exception(); } }); try { // First call triggers the autoloader new Foo(); } catch (Exception $e) {} // For the second call Foo is loaded var_dump(new Foo()); // Even though it’s missing the interface var_dump(new Foo() instanceof Foointerface); var_dump((new ReflectionClass('Foo'))->getInterfaces());
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