Learn and sort out several internal functions for mathematical calculations in PHP_PHP Tutorial

round
round - Round floating point numbers. The round function syntax is as follows:

round(float,precision)
The parameter precision represents the number of precision digits to be maintained after the decimal point. If the parameter precision is not written, it means rounding to an integer, for example:

echo round(3.4); // 3echo round(3.5); // 4echo round(3.6); // 4
if precision 2 means rounding to 2 decimal places. An example is as follows:

echo round(1.95583, 2); // 1.96
If the parameter precision is a negative number, it means rounding to the decimal point. For example:

echo round(1241757, -3); // 1242000
floor
floor - Rounding by rounding. The floor function syntax is as follows:

floor (value)
floor function returns the largest integer not greater than value, that is, the decimal part of value is rounded off. Examples are as follows:

echo floor(4); //4
echo floor(4.3); // 4echo floor(9.999); // 9
ceil
ceil - further method Round up. The ceil function syntax is as follows:

ceil (value)
ceil function returns the smallest integer that is not less than value. Examples are as follows:

echo ceil(4); //4
echo ceil(4.3); // 5echo ceil(9.999); // 10
pow
pow - exponentiation. The syntax of the pow function is as follows:

pow (base,exp)
The pow function returns base raised to the power of exp. The following example represents finding 2 raised to the power of 8, and the returned result is 256.

echo pow(2, 8); // 256
rand
rand - Generate a random integer. The rand function syntax is as follows:

rand (min,max)
rand function returns a random integer between the minimum value min and the maximum value max (including min, max). For example, the following example returns a random integer between 2 and 6.

echo rand(2,6);
max
max - Returns the largest value in the parameter.

If the max function has only one parameter and it is an array, max returns the largest value in the array. An example of the

max function is as follows:

echo max(1, 3, 5, 6, 7); // 7echo max(array(2, 4, 5)); // 5
min
min - Returns the minimum value in the argument.

If the min function has only one parameter and it is an array, min returns the smallest value in the array.

min function example is as follows:

echo min(1, 3, 5, 6, 7); // 1echo min(array(2, 4, 5)); // 2
decbin
decbin - Convert decimal to binary. The syntax of the decbin function is as follows:

decbin (number)
decbin returns a string, that is, returns the binary representation of the parameter number. An example is as follows:

echo decbin(12);
DE>decbin(12)DE> The returned result is:

1100
bindec
bindec - binary conversion to decimal. The syntax of the bindec function is as follows:

bindec (binary_string) The
bindec function converts the binary string binary_string into a decimal integer. Examples are as follows:

echo bindec('110011'); //51
dechex, hexdec
dechex - Convert decimal to hexadecimal.

hexdec - Convert hexadecimal to decimal.

dechex, hexdec function examples are as follows:

echo dechex(47); //2f
echo hexdec('2f'); //47
decoct, octdec
decoct - Convert decimal to octal

octdec - Convert octal to decimal

decot, octdec function examples are as follows:

echo decoct(12); //14
echo octdec('14'); //12