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<?php /* Дан массив с числами. Найдите сумму элементов, расположенных от начала массива до первого отрицательного числа. */ $arr = [1, 2, 3, 6, -1, 4, 5]; $sum = 0; $pos = 0; array_walk($arr, function ($a, $b) use($pos) { if ($a < 0) { $pos = $b; } }); var_dump($pos);die(); // $sum = array_sum($posArr);
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