Question

How to implement the power function in PHP

Answer 1

function myPow($base, $exponent) {
    $result = 1;

    while ($exponent > 0) {
        if (($exponent & 1) == 1) {
            $result *= $base;
        }
        $exponent >>= 1;
        $base *= $base;
    }

    return $result;
}

echo myPow(2, 3) . "\n";  // 8
echo myPow(3, 3) . "\n";  // 27
echo myPow(3, 2) . "\n";  // 9
echo myPow(2, 2) . "\n";  // 4
echo myPow(5.0, 2) . "\n";  // 25
echo myPow(-2, 4) . "\n"; // 16



/*
run:

8
27
9
4
25
16

*/

 

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