Base_convert ($number, $frombase, $tobase)//Convert a number between arbitrary binaries
Ceil ($float)//Up rounding
Floor ($float)//Down rounding
EXP ($float)//calculate E's exponent
Hypot ($x, $y)//Calculate the hypotenuse length of right triangle
Is_nan ($val)//Determine if it is a valid value
Log ($arg [, $base =e])//natural logarithm
Max ($num 1, $num 2, ...)//Find out the maximum value
Max ($arr)//Find out the maximum value in the array
Min ($num 1, $num 2, ...)//Find the minimum value
RAND ([$min], $max)//Generate a random integer
Srand ([$seed])//sowing random number generator seeds
Mt_rand ([$min], $max)//Generate better random numbers
Mt_srand ($seed)//sowing a better random number generator seed
PI ()//Get PI Value
Pow ($base, $exp)//exponential expression
sqrt ($float)//Seek square root
Deg2rad ($float)//convert angle to radians
Rad2deg ($float)//Convert the number of radians to the corresponding number of angles
Round ($val [, $pre = 0])//rounding of floating-point numbers
Fmod ($x, $y)//Returns the remainder of the floating-point number for division
PHP Math function