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- <?php
- declare(strict_types = 1);
- function sum(int $a, int $b, callable $sumInterception): int
- {
- $sumInterception($a, $b);
- return $a + $b;
- }
- printf(sum(1, 2, function ($a, $b) {
- printf('Calculating: %d + %d = ', $a, $b);
- }));
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