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<?php
// Function to convert a number to its corresponding word representation
function convertNumberToWords($number) {

    // Handle negative numbers
    if ($number < 0) {
        return 'negative ' . convertNumberToWords(-$number);
    }

    // Handle special cases (zero, one, two)
    $specialCases = ['zero', 'one', 'two'];
    if (array_key_exists($number, $specialCases)) {
        return $specialCases[$number];
    }

    // Break the number into digits
    $digits = str_split($number);
    $word = '';

    // Process each digit, starting from the least significant
    foreach ($digits as $digit) {
        // Handle digits 0-9
        if ($digit >= 0 && $digit <= 9) {
            $word .= ' ' . convertDigitToWord($digit);
        }
        // Handle teens (11-19)
        elseif ($number >= 11 && $number <= 19) {
            $word .= ' ' . convertTeenToWord($number);
        }
        // Handle tens (20, 30, 40, etc.)
        elseif ($number % 10 == 0) {
            $word .= ' ' . convertTenToWord($number);
        }
        // Handle hundreds, thousands, millions, etc.
        elseif ($number >= 1000) {
            $magnitude = floor(log10($number) / 3);
            $magnitudeName = convertMagnitudeToWord($magnitude);
            $word .= ' ' . convertNumberToWords($number / pow(10, 3 * $magnitude)) . ' ' . $magnitudeName;
        }
    }

    // Handle special cases for 100 and 1000
    if ($number == 100) {
        $word = 'one hundred';
    } elseif ($number == 1000) {
        $word = 'one thousand';
    }

    // Trim leading spaces and return the result
    return trim($word);
}

// Convert a single digit to its corresponding word representation
function convertDigitToWord($digit) {
    $digits = ['zero', 'one', 'two', 'three', 'four', 'five', 'six', 'seven', 'eight', 'nine'];
    return $digits[$digit];
}

// Convert a teen number (11-19) to its corresponding word representation
function convertTeenToWord($number) {
    $teens = ['eleven', 'twelve', 'thirteen', 'fourteen', 'fifteen', 'sixteen', 'seventeen', 'eighteen', 'nineteen'];
    return $teens[$number - 11];
}

// Convert a tens number (20, 30, 40, etc.) to its corresponding word representation
function convertTenToWord($number) {
    $tens = ['twenty', 'thirty', 'forty', 'fifty', 'sixty', 'seventy', 'eighty', 'ninety'];
    return $tens[$number / 10 - 2];
}

// Convert a magnitude (thousands, millions, billions, etc.) to its corresponding word representation
function convertMagnitudeToWord($magnitude) {
    $magnitudes = ['', 'thousand', 'million', 'billion', 'trillion', 'quadrillion', 'quintillion', 'sextillion', 'septillion', 'octillion', 'nonillion', 'decillion'];
    return $magnitudes[$magnitude];
}

// Example usage
$number = 9876543210;
$word = convertNumberToWords($number);

echo "$number in words: $word";
?>

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