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<?php spl_autoload_register(function($name){ if($name == 'C') { spl_autoload_register(function($name){ if($name == 'C') { class C { function __construct(){ echo "I'm C.\n"; } } } }); } }); $c = new C();
Output for 5.5.0 - 5.5.38, 5.6.0 - 5.6.30, 7.0.3 - 7.0.20, 7.1.0 - 7.1.20, 7.2.0 - 7.2.33, 7.3.16 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6
I'm C.
Output for 7.0.0 - 7.0.2
Fatal error: Uncaught Error: Class 'C' not found in /in/f1njG:16 Stack trace: #0 {main} thrown in /in/f1njG on line 16
Process exited with code 255.

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