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<?php interface A {} interface B {} class NeedsA { function __construct(A $a) {} } class NeedsB extends NeedsA { function __construct(B $b) {} } var_dump(new NeedsB(new class implements B {}));
Output for 8.0.1 - 8.0.30, 8.1.0 - 8.1.34, 8.2.0 - 8.2.30, 8.3.0 - 8.3.30, 8.4.1 - 8.4.18, 8.5.0 - 8.5.3
object(NeedsB)#1 (0) { }

preferences:
95.48 ms | 1101 KiB | 4 Q