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:

<?php
// 加法
print("加法: 10 + 20 = ");
print(10 + 20); 　　　　　　　　　　// 10 + 20 的结果;
print("\n");

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

<?php
$aisatsu = "php中文网";
print($aisatsu);
?>

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

<?php
$x = 3;
if($x == 3) {
  print(&#39;$x等于3&#39;);
  print("\n");
}
if ($x >= 2) {
  print(&#39;$x大于或者等于2&#39;);
  print("\n");
}
if ($x <= 2) {
  print(&#39;$x小于或者等于2&#39;);
  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

<?php
$x = 3;
if($x >= 1 and $x <= 10){
  print(&#39;$ x大于或等于1且小于或等于10。&#39;);
  print("\n");
}
if($x >= 4 || $x <= 5 ){
  print(&#39;$ x大于或等于4或小于或等于5。&#39;);
  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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