Front-end PHP entry -019-mathematical functions of built-in functions-very important

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Name of function	Description	Example	input	Output
ABS ()	Seek absolute value	$abs = ABS (-4.2); 4.2	Digital	Absolute number
Ceil ()	into a method to take the whole	echo ceil (9.999); 10	Floating point number	into a rounding
Floor ()	Rounding out the whole method of rounding	echo Floor (9.999); 9	Floating point number	Go directly to the decimal parts
Fmod ()	Floating-point number to take surplus	" x = 5.7 x = 5.7 ; y = 1.3; r=fmod( r = f m o d ( X y ) ; < span class= "Mo" id= "mathjax-span-23" style= "Font-family:mathjax_main;" >/ / y ) ; / / R equals 0.5, because 4 * 1.3 + 0.5 = 5.7 "	Two floating-point numbers, x>y	Floating-point remainder
POW ()	Returns the number of the n-th square	Echo Pow (-1, 20); 1	Base number n-th square	exponentiation value
Round ()	Floating-point rounding	Echo Round (1.95583, 2);//1.96	A numeric value	How many bits are reserved after the decimal point, the default is 0 rounded results
sqrt ()	Find square root	echo sqrt (9); 3	The number of the being prescribed	Square root
Max ()	To find the maximum value	"Echo Max (1, 3, 5, 6, 7); 7 echo Max (Array (2, 4, 5)); 5 "	Multiple numbers or arrays	Returns the maximum value
Min ()	To find the minimum value	Min	Multiple numbers or arrays	Returns the minimum value
Mt_rand ()	A better random number	echo Mt_rand (0,9);//n	Min/MAX, random number	Values in the range returned randomly
RAND ()	Random number	echo rand ()	Min/MAX, random number	Values in the range returned randomly
Pi ()	Get the PI value	echo Pi (); 3.1415926535898	No	Get pi

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Front-end PHP entry -019-mathematical functions of built-in functions-very important