How do you calculate if PHP is open n times?

PHP has an open square function sqrt (), but I now want to open a number of 1.2-time square, what good way? Can only write a function yourself?

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PHP has an open square function sqrt (), but I now want to open a number of 1.2-time square, what good way? Can only write a function yourself?

Look at the wrong =. =, with POW (). Mathematical principle 25 of the open square will be 25 of 1/2 times, so 25 of the open 1.2 will be, 25 of 1/1.2 square pow (25,1/1.2)

The POW () function, such as 100 to 1.2, is 100 1/1.2, written as POW (100,1/1.2)

php5.6 useecho 25**(1/1.2);//14.620088691064

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