What are PHP math functions? How to use it?

In the previous article "Teach you how to use the eight magic constants commonly used in PHP (detailed examples)", the relevant knowledge of the eight magic constants in PHP was introduced in detail. This article Let’s learn about the mathematical functions in PHP. I hope it will be helpful to everyone!

In the previous study, we learned about a lot of functions, including custom functions. Next, let’s take a look at the relevant knowledge of mathematical functions in PHP. That is the PHPMath function. The Math function in PHP is the core component of PHP, so it also needs to be understood in the process of learning PHP.

Next let’s take a look at the mathematical functions in PHP.

What are PHP mathematical functions?

Before introducing mathematical functions, let’s review them now. What are functions? In the knowledge of mathematics, we have learned about functions. Functions and function parameters are inseparable. When the parameters of the function are determined, the value of the function is also determined, and the rules used for this parameter are also determined. our function.

Mathematical functions use mathematical knowledge when controlling the rules of function values. Mathematical functions can handle values ​​in the range of integer and float. Let's take a look at several mathematical functions commonly used in PHP and their usage.

Usage of common mathematical functions in PHP

There are many mathematical functions in PHP, and there are many problems that can be solved, such as finding the maximum and minimum values. value, rounding floating point numbers, finding square roots, etc. Next, let’s take a look at what kind of functions can be achieved.

<span style="font-size: 18px;"><strong>##abs()<span style="font-size: 16px;"></span></strong></span>##Function

abs()

The function can be said to be the simplest one among mathematical functions. The abs() function can return the absolute value of a number. , the basic syntax format of the abs() function is as follows:

abs(mixed $number): number

It should be noted that the parameter

$number

represents the value that needs to be processed, and the number returned is the absolute value of the parameter. , and if the parameter $number is float, the returned result is also float. Let’s take a look at the use of the abs() function through an example. The example is as follows:

<?php
$abs = abs(-4.2); // $abs = 4.2; (double/float)
$abs2 = abs(5);   // $abs2 = 5; (integer)
$abs3 = abs(-5);  // $abs3 = 5; (integer)
echo $abs . &#39;<br/>&#39;;
echo $abs2 . &#39;<br/>&#39;;
echo $abs3;
?>

Output result:

As you can see from the above example, the absolute value of the parameter can be obtained through the abs() function.

<span style="font-size: 18px;">ceil()<strong><span style="font-size: 16px;"></span></strong></span>##FunctionIn PHP, you can use the
ceil()

function to complete the rounding of a number. That is, calculate the smallest integer greater than one number. The basic syntax format of this function is as follows:

ceil(float $value): float

It should be noted that: what needs to be returned is the next integer that is not less than the parameter $value

, which is the return value float; if the parameter $ If the value has a decimal part, it will be advanced by one place.

Next let’s take a look at the use of the ceil() function through an example. The example is as follows:

<?php
echo ceil(4.3) . &#39;<br/>&#39;;    // 5
echo ceil(9.999) . &#39;<br/>&#39;;  // 10
echo ceil(-3.14);  // -3
?>

Output result:

In the above example, we completed the rounding of a number through the ceil() function.

floor()<span style="font-size: 18px;"><strong><span style="font-size: 16px;"></span></strong></span>##FunctionThe floor()
function can complete the rounding of a number, that is, rounding down to the nearest integer. The basic syntax format of this function is as follows:

floor(float $value): float

It should be noted that: return the nearest integer that is not greater than value, discard the decimal part and round it up. Parameter $value represents the number to be rounded.

Next let’s look at the use of the floor() function through an example. The example is as follows: <pre class="brush:php;toolbar:false">&lt;?php echo floor(4) . &quot;&lt;br&gt;&quot;; //4 echo floor(3.3) . &quot;&lt;br&gt;&quot;; //3 echo floor(6.999); //6 ?&gt;</pre>Output result:

In the above example, the rounding of a number is completed through the floor() function.

##pow()

<span style="font-size: 18px;"><strong><span style="font-size: 16px;"></span></strong>Function</span>pow()The function can obtain the nth power of a number, that is, perform power operations. The basic syntax format of this function is as follows:

pow(number $base, number $exp): number

其中需要注意的是：返回的结果是base 的 exp 次方的幂，参数$base标识的就是目标数，参数$exp表示的是目标数的指数。

接下来我们通过示例来看一下pow()函数的使用，示例如下：

<?php
var_dump(pow(2, 8)); // int(256)
echo &#39;<br/>&#39;;
echo pow(-1, 20) . &#39;<br/>&#39;; // 1
echo pow(0, 0); // 1
?>

输出结果：

上述示例中便是通过pow()函数来进行一个数的n次方运算。

上文介绍的知识数学函数中的一小部分，数学函数还有很多例如：

• Acos: 取得反余弦值。

• Asin: 取得反正弦值。

• Atan: 取得反正切值。

• Atan2: 计算二数的反正切值。

• base_convert: 转换数字的进位方式。

• BinDec: 二进位转成十进位。

大家如果感兴趣的话，可以点击《PHP视频教程》进行更多关于PHP知识的学习。

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