<?php

namespace PhpOffice\PhpSpreadsheet\Calculation\MathTrig;

use PhpOffice\PhpSpreadsheet\Calculation\Exception;
use PhpOffice\PhpSpreadsheet\Calculation\Functions;
use PhpOffice\PhpSpreadsheet\Calculation\Information\ExcelError;

class Lcm
{
    //
    //    Private method to return an array of the factors of the input value
    //
    private static function factors(float $value): array
    {
        $startVal = floor(sqrt($value));

        $factorArray = [];
        for ($i = $startVal; $i > 1; --$i) {
            if (($value % $i) == 0) {
                $factorArray = array_merge($factorArray, self::factors($value / $i));
                $factorArray = array_merge($factorArray, self::factors($i));
                if ($i <= sqrt($value)) {
                    break;
                }
            }
        }
        if (!empty($factorArray)) {
            rsort($factorArray);

            return $factorArray;
        }

        return [(int) $value];
    }

    /**
     * LCM.
     *
     * Returns the lowest common multiplier of a series of numbers
     * The least common multiple is the smallest positive integer that is a multiple
     * of all integer arguments number1, number2, and so on. Use LCM to add fractions
     * with different denominators.
     *
     * Excel Function:
     *        LCM(number1[,number2[, ...]])
     *
     * @param mixed ...$args Data values
     *
     * @return int|string Lowest Common Multiplier, or a string containing an error
     */
    public static function evaluate(...$args)
    {
        try {
            $arrayArgs = [];
            $anyZeros = 0;
            $anyNonNulls = 0;
            foreach (Functions::flattenArray($args) as $value1) {
                $anyNonNulls += (int) ($value1 !== null);
                $value = Helpers::validateNumericNullSubstitution($value1, 1);
                Helpers::validateNotNegative($value);
                $arrayArgs[] = (int) $value;
                $anyZeros += (int) !((bool) $value);
            }
            self::testNonNulls($anyNonNulls);
            if ($anyZeros) {
                return 0;
            }
        } catch (Exception $e) {
            return $e->getMessage();
        }

        $returnValue = 1;
        $allPoweredFactors = [];
        // Loop through arguments
        foreach ($arrayArgs as $value) {
            $myFactors = self::factors(floor($value));
            $myCountedFactors = array_count_values($myFactors);
            $myPoweredFactors = [];
            foreach ($myCountedFactors as $myCountedFactor => $myCountedPower) {
                $myPoweredFactors[$myCountedFactor] = $myCountedFactor ** $myCountedPower;
            }
            self::processPoweredFactors($allPoweredFactors, $myPoweredFactors);
        }
        foreach ($allPoweredFactors as $allPoweredFactor) {
            $returnValue *= (int) $allPoweredFactor;
        }

        return $returnValue;
    }

    private static function processPoweredFactors(array &$allPoweredFactors, array &$myPoweredFactors): void
    {
        foreach ($myPoweredFactors as $myPoweredValue => $myPoweredFactor) {
            if (isset($allPoweredFactors[$myPoweredValue])) {
                if ($allPoweredFactors[$myPoweredValue] < $myPoweredFactor) {
                    $allPoweredFactors[$myPoweredValue] = $myPoweredFactor;
                }
            } else {
                $allPoweredFactors[$myPoweredValue] = $myPoweredFactor;
            }
        }
    }

    private static function testNonNulls(int $anyNonNulls): void
    {
        if (!$anyNonNulls) {
            throw new Exception(ExcelError::VALUE());
        }
    }
}

• [D] Trig
• [F] Absolute.php
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• [F] Angle.php
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• [F] Arabic.php
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• [F] Base.php
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• [F] Ceiling.php
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• [F] Combinations.php
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• [F] Exp.php
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• [F] Factorial.php
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• [F] Floor.php
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• [F] Gcd.php
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• [F] Helpers.php
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• [F] IntClass.php
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• [F] Lcm.php
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• [F] Logarithms.php
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• [F] MatrixFunctions.php
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• [F] Operations.php
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• [F] Random.php
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• [F] Roman.php
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• [F] Round.php
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• [F] SeriesSum.php
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• [F] Sign.php
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• [F] Sqrt.php
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• [F] Subtotal.php
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• [F] Sum.php
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• [F] SumSquares.php
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• [F] Trunc.php
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