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<?php spl_autoload_register(function ($class) { class Foo{ public function __construct() { echo 'Foo'; } }; class_alias('Foo', 'Bar'); class_alias('Foo', 'Bar'); var_dump(debug_backtrace(DEBUG_BACKTRACE_IGNORE_ARGS, 2)); }, true, true); $bar = new Foo(); $bar2 = new Bar();
Output for git.master, git.master_jit, rfc.property-hooks
Warning: Cannot declare class Bar, because the name is already in use in /in/v8bKo on line 11 array(1) { [0]=> array(3) { ["file"]=> string(9) "/in/v8bKo" ["line"]=> int(15) ["function"]=> string(9) "{closure}" } } FooFoo

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