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function binarySearch(array $arr, int $target): int $left = 0; $right = count($arr) - 1; while ($left <= $right) $mid = $left + (($right - $left) >> 1); // faster than floor() if ($arr[$mid] === $target) return $mid; if ($arr[$mid] < $target) $left = $mid + 1; else $right = $mid - 1; Conclusion: Your Next Step to PHP 7 Mastery
// Using SplFixedArray for 100k integers $array = new SplFixedArray(100000); for ($i = 0; $i < 100000; $i++) $array[$i] = $i;
return -1;