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run code in 300+ PHP versions simultaneously
<?php function sum($x) { return new class ($x) { function __construct(private int $x = 0) {} function __invoke($num): static { return new static($num + $this->x); } function __toString(): string { return (string)$this->x; } }; } echo sum(1000)(400)(80)(8)(200)(20)(2);
Output for 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.25, 8.4.1 - 8.4.12
1710

preferences:
65.66 ms | 406 KiB | 5 Q