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@ 2022-12-08T10:31:05Z

<?php

class x {
    public function m() {}
}

class y extends x {
    public function m():?string {
        return "1";
    }
}

$x = new x();
$y = new y();
$x->m();
$y->m();

Output
Performance
VLD
References
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Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.6

preferences:dark modelive preview

113.61 ms | 402 KiB | 89 Q