bcpow

string bcpow(string left_operand, string right_operand, [int scale]) 

left_operand	Number to be raised
right_operand	Number to raise by
scale	Number of decimal places to return

Calculates the exponent of a number.

Returns:

Value of exponent

Description:

Raises the left operand to the power of the right operand. Either number can be an integer or floating-point value. Returns the result with a specified number of decimal places (optional).

Version:

Existing since version 3.0

Example:

Raise to the power of a large number

$num1 = "9912343.21"; 
$num2 = "2.35"; 
echo bcpow($num1,$num2); 

Output: 
98254543749649