Summary of commonly used mathematical functions in PHP, summary of mathematical functions_PHP tutorial

A summary of commonly used mathematical functions in PHP, a summary of mathematical functions

The examples in this article summarize and analyze the commonly used mathematical functions in PHP. Share it with everyone for your reference. The specific analysis is as follows:

Abs() function definition and usage: Returns the absolute value of a number.

Syntax: abs(x), the code is as follows:

Copy code The code is as follows:

$abs=abs(-3.2); //$abs=3.2
$abs2=abs(5); //$abs2=5
$abs3=abs(-5); //$abs3=5

ceil() function definition and usage: Round up to the nearest integer.

Syntax ceil(x)

参数	描述
x	必需,一个数.

Note: Return the next integer that is not less than x. If x has a decimal part, it will be rounded up. The type returned by ceil() is still float, because the range of float values ​​is usually larger than integer. The example code is as follows:

Copy code The code is as follows:

echo ceil(5); //5
echo "
";
echo ceil(3.3); //4
echo "
";
echo ceil(6.999); //7

The floor() function rounds down to the nearest integer.

Syntax: floor(x)

参数	描述
x	必需,一个数.

Note: Return the next integer not greater than x, round off the decimal part of x, and the type returned by floor() is still float, because the range of float values ​​is usually larger than integer.

Copy code The code is as follows:

echo floor(4); //4
echo "
";
echo floor(3.3); //3
echo "
";
echo floor(6.999); //6

Definition and Usage

fmod() function returns the floating point remainder of division.

Syntax: fmod(x,y)

参数	描述
x	必需,一个数.
y	必需,一个数.

Description: Returns the floating-point remainder obtained by dividing the dividend (x) by the divisor (y). The definition of the remainder (r) is: x = i * y + r, where i is an integer. If y is a non-zero value, then The signs of r and x are the same and their quantitative value is smaller than y. The code is as follows:

Copy code The code is as follows:

$x=4.7; //Define value 1
$y=1.3; //Define value 2
$r=fmod($x,$y); //Perform remainder operation
The floating point remainder of echo $x." divided by ".$y." is: ".$r; //Output result

log10() Logarithm to base 10.

Syntax: log10(x)

参数	描述
x	必需,一个数.

Description: Return the base 10 logarithm of parameter x, the code is as follows:

Copy code The code is as follows:

$num1=100;
$num2=1000;
$num3=3;
$result1=log10($num1);
$result2=log10($num2);
$result3=log10($num3);
echo "The base 10 logarithm of $num1 is $result1";
echo "
";
echo "The base 10 logarithm of $num2 is $result2";
echo "
";
echo "The base 10 logarithm of $num3 is $result3";
echo "
";

log() returns the natural logarithm.

Syntax: log(x,base)

参数	描述
x	必需,一个数.

base is optional. If this parameter is specified, logbasex.

will be returned.

Note: If the optional parameter base is specified, log() returns logbasex, otherwise log() returns the natural logarithm of parameter x. The example code is as follows:

Copy code The code is as follows:

echo log(2.7183); //Returns the natural logarithm of the specified value
echo "
";
echo log(2); //Return the natural logarithm of the specified value
echo "
";
echo log(1); //Return the natural logarithm of the specified value
echo "
";
echo log(0); //Return the natural logarithm of the specified value
echo "
";
echo log(-1); //Return the natural logarithm of the specified value
//
echo sqrt(9); //Output 3
echo "
";
echo sqrt(10); //3.16227766... ​​
//
var_dump(pow(2, 8)); //Output 256
echo "
";
echo pow(-1,20); //Output 1
echo "
";
echo pow(0,0); //Output 1
echo "
";
echo pow(-1, 4.5); //Return error

I hope this article will be helpful to everyone’s PHP programming design.

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