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<?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());
Output for git.master, git.master_jit, rfc.property-hooks
Fatal error: Uncaught Exception in /in/s8ti7:7 Stack trace: #0 /in/s8ti7(5): {closure}('Foointerface') #1 /in/s8ti7(17): {closure}('Foo') #2 {main} thrown in /in/s8ti7 on line 7
Process exited with code 255.

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