<?php
interface Feature
{
public static function fromInput(array $featureInput) : self;
}
final class Covariance implements Feature
{
public static function fromInput(array $featureInput) : Feature
{
return new self();
}
}
$covariantReturnType = Covariance::fromInput([]);
var_dump($covariantReturnType);
Warning: PHP Startup: Unable to load dynamic library 'sodium.so' (tried: /usr/lib/php/8.3.5/modules/sodium.so (libsodium.so.23: cannot open shared object file: No such file or directory), /usr/lib/php/8.3.5/modules/sodium.so.so (/usr/lib/php/8.3.5/modules/sodium.so.so: cannot open shared object file: No such file or directory)) in Unknown on line 0
object(Covariance)#1 (0) {
}