<?php namespace FOO; class FOO { public const FOO = null; public $X = null; public function BAR(): void {} } echo class_exists('foo\foo') ? 'x':'o'; echo method_exists(FOO::class, 'bar') ? 'x':'o'; echo property_exists(FOO::class, 'x') ? 'x':'o'; echo defined(FOO::class.'::foo')? 'x':'o';
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