How to implement simple arithmetic operations in php?

In the process of web development, arithmetic operations are one of the essential functions. As a widely used server-side scripting language, PHP provides numerous arithmetic operations functions and methods. This article will introduce in detail how to use PHP to implement simple arithmetic operations.

1. Variable assignment

In PHP, use the assignment operator (=) to assign a value to a variable. Variables can store various types of values, such as strings, integers, or floating point numbers. The following is the basic syntax for variable assignment:

<?php
  $a = 10;  //将整数10赋值给变量$a
  $b = 3.14;  //将浮点数3.14赋值给变量$b
  $c = "hello world"; //将字符串"hello world"赋值给变量$c
?>

2. Mathematical operators

PHP supports six basic mathematical operators, namely addition (), subtraction (-), and multiplication (), division (/), modulo (%) and exponent (*). These operators can be used on any type of number, including integers and floating point numbers. Here are examples of each operator:

1, addition operator ( )

<?php
  $a = 10;
  $b = 20;
  $c = $a + $b;
  echo $c;  //输出30
?>

2, subtraction operator (-)

<?php
  $a = 20;
  $b = 10;
  $c = $a - $b;
  echo $c;  //输出10
?>

3, multiplication operator ( *)

<?php
  $a = 10;
  $b = 20;
  $c = $a * $b;
  echo $c;  //输出200
?>

4. Division operator (/)

<?php
  $a = 20;
  $b = 10;
  $c = $a / $b;
  echo $c;  //输出2
?>

5. Modulo operator (%)

The modulo operator returns the result of dividing two numbers remainder.

<?php
  $a = 20;
  $b = 10;
  $c = $a % $b;
  echo $c;  //输出0
?>

6. Exponential operator (**)

The exponent operator returns the exponential power of a base number.

<?php
  $a = 2;
  $b = 3;
  $c = $a ** $b;
  echo $c;  //输出8
?>

3. Auto-increment and auto-decrement operators

PHP also provides auto-increment ( ) and auto-decrement (--) operators, which are used to increase or decrease the value of a variable. The increment and decrement operators can only be used with numeric variables.

1. Auto-increment operator ( )

The auto-increment operator adds 1 to the value of the variable.

<?php
  $a = 10;
  $a++;
  echo $a;  //输出11
?>

2. Decrement operator (--)

The decrement operator decreases the value of the variable by 1.

<?php
  $a = 10;
  $a--;
  echo $a;  //输出9
?>

4. Mathematical functions

PHP also provides some functions for mathematical calculations, such as absolute value, square root, sine and cosine. The following are some commonly used mathematical functions:

1. abs(): Returns the absolute value of a number.

<?php
  $a = -10;
  $b = abs($a);
  echo $b;  //输出10
?>

2. sqrt(): Returns the square root of a number.

<?php
  $a = 16;
  $b = sqrt($a);
  echo $b;  //输出4
?>

3. sin(): Returns the sine value of an angle.

<?php
  $a = 30;
  $b = sin($a * pi() / 180);  //将角度转换为弧度
  echo $b;  //输出0.5
?>

4. cos(): Returns the cosine value of an angle.

<?php
  $a = 60;
  $b = cos($a * pi() / 180);  //将角度转换为弧度
  echo $b;  //输出0.5
?>

5. tan(): Returns the tangent value of an angle.

<?php
  $a = 45;
  $b = tan($a * pi() / 180);  //将角度转换为弧度
  echo $b;  //输出1
?>

5. Summary

In PHP, you can use basic operators and functions to perform arithmetic operations. Arithmetic operations can be easily implemented using mathematical operators and functions, while the values ​​of variables can be easily modified using increment and decrement operators. More advanced mathematical functions can also be used when more complex mathematical calculations are required. I hope this article can help everyone learn and use PHP.

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