How To Calculate Fibonacci Extensions using PHP?

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function fibonacci($n) {
    $a = 0;
    $b = 1;

    for ($i = 0; $i < $n; $i++) {
        $temp = $a;
        $a = $b;
        $b = $temp + $b;
    }

    return $a;
}

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$n = 10; // number of Fibonacci numbers to calculate
$fibonacci_numbers = array();

for ($i = 0; $i < $n; $i++) {
    $fibonacci_numbers[$i] = fibonacci($i);
}

// Print the Fibonacci numbers
print_r($fibonacci_numbers);

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$extension_ratio = 1.618; // extension ratio for Fibonacci extensions

$extension_numbers = array();
for ($i = 0; $i < $n; $i++) {
    $extension_numbers[$i] = $fibonacci_numbers[$i] * $extension_ratio;
}

// Print the Fibonacci extensions
print_r($extension_numbers);

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function fibonacci($n) {
    $a = 0;
    $b = 1;

    for ($i = 0; $i < $n; $i++) {
        $temp = $a;
        $a = $b;
        $b = $temp + $b;
    }

    return $a;
}

$n = 10; // number of Fibonacci numbers to calculate
$fibonacci_numbers = [];
$extension_ratio = 1.618; // extension ratio for Fibonacci extensions

for ($i = 0; $i < $n; $i++) {
    $fibonacci_numbers[$i] = fibonacci($i);
}

// Calculate Fibonacci extensions
$extension_numbers = [];
foreach ($fibonacci_numbers as $fibonacci_number) {
    $extension_numbers[] = $fibonacci_number * $extension_ratio;
}

// Print Fibonacci numbers and extensions
echo "Fibonacci Numbers: " . implode(", ", $fibonacci_numbers) . "
";
echo "Fibonacci Extensions: " . implode(", ", $extension_numbers);