How I find the equation output with PHP by pow (num*num)

The function is explained in the official documentation: PHP: pow - Manual[^].

As you can see, it takes two arguments (base and exponent), and returns the result of the performed operation base^exponent.

If you for example want to calculate the power of a number to the base 10, use something like

$result = pow($num, 10);
echo "$result";

or just

echo pow($num, 10);