PHP in a Nutshell

Name

sqrt()

Synopsis

    float sqrt ( float num )
    To obtain the square root of a number, use the sqrt() function 
, which takes
    as its parameter the value you wish to calculate the square root of:
    print sqrt(25);
    print sqrt(26);

That will output 5 as the result of line one, then 5.0990195135928 for line two.