Basic explanation of PHP: How to use the four operators in PHP

The

operator is a symbol used to add or subtract programmatically. It can also be used to compare the size of two values and determine whether they are the same or different. This article will introduce you to the operators in PHP. Instructions.

There are four commonly used operators in php: arithmetic operators, assignment operators, comparison operators, logical operators

Below Let's take a look at the usage of these four operators respectively.

1. Arithmetic operators

The symbols of arithmetic operators are, -, *, /, %

Let’s look at the code Example

Addition:

      
Subtraction:
      
// 减法 print("减法: 100 - 20 = "); print(100 - 20); 　　　　　　　　　　// 100 - 20 的结果。 print("\n");
      
Multiplication:
      
// 乘法 print("乘法: 9 * 5 = "); print(9 * 5); 　　　　　　　　　　// 9 * 5 的结果。 print("\n");
      
Division:
      
// 除法 print("除法: 100 / 10 = "); print(100 / 10); 　　　　　　　　　　// 100 / 10 的结果。 print("\n");
      
Remainder:
      
// 余数 print("余数: 45 % 10 = "); print(45 % 10); 　　　　　　　　　　// 45 % 10 的余数。 print("\n"); ?>
      
The result of the operation is:
      
加法：10 + 20 = 30 减法：100 - 20 = 80 乘法：9 * 5 = 45 除法：100/20 = 5 余数：45％10 = 5
      
2. Assignment operator

      
The assignment operator is represented by "=".
      
变量=数值（或变量）
      
means assigning "value (or variable)" to "variable"

      
Let's look at the specific example
      
The code is as follows
      

      
Run The results are as follows:

      
php中文网
      
The string "php Chinese network" is assigned to $aisatsu.
      
The result of printing $aisatsu is displayed as "php Chinese website" through the print function. Of course, in addition to strings, values and variables can also be assigned by assignment operators.
      
3. Comparison operators

      
Comparison operators are expressed as "==, > =, <=".
      
Let’s look at a specific example

      
The code is as follows
      
= 2) { print('$x大于或者等于2'); print("\n"); } if ($x <= 2) { print('$x小于或者等于2'); print("\n"); } ?>
      
The running result is:
      
$x等于3 大于或者等于2 $x小于或者等于2
      
4. Logical operators

      
Logical operators are expressed as "and, or, &&, ||". "and" and "&&", "or" and "||" respectively have the same meaning.
      
and" and "&&" represent condition A and condition B; "or" and "||" represent condition A or condition B.
      
Let's look at specific examples
      
The code is as follows

      
= 1 and $x <= 10){ print('$ x大于或等于1且小于或等于10。'); print("\n"); } if($x >= 4 || $x <= 5 ){ print('$ x大于或等于4或小于或等于5。'); print("\n"); } ?>
      
The running result is:

      
$ x大于或等于1且小于或等于10。 $ x大于或等于4或小于或等于5。
      
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