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<?php const fuN = 1; new test; class test{ public function __construct() { fuN; $this->fun(); // prints test->fun $this->fuN(); //Call to undefined method test::fuN() fuN; // coment this out for : Uncaught Error: Undefined constant "fuN" } function fun(){ echo "<p>" . __CLASS__ . "->" . __FUNCTION__ . "</p>"; } }
Output for 7.3.0 - 7.3.33, 7.4.0 - 7.4.29, 8.0.0 - 8.0.19, 8.1.0 - 8.1.6
<p>test->fun</p><p>test->fun</p>

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