PHP操作符笔记
直接复制来的,只是用来方便查询
运算符(Arithmetic Operators)
Operator 符号 | Description 描述 | Example 案例 | Result 结果 |
---|---|---|---|
+ | Addition 加号 |
x=2 x+2 |
4 |
- | Subtraction 减号 |
x=2 5-x |
3 |
* | Multiplication 乘号 |
x=4 x*5 |
20 |
/ | Division 除号 |
15/5 5/2 |
3 2.5 |
% | Modulus (division remainder) 求模(余数) |
5%2 10%8 10%2 |
1 2 0 |
++ | Increment 自加 |
x=5 x++ |
x=6 |
-- | Decrement 自减 |
x=5 x-- |
x=4 |
Assignment Operators
分配符(Assignment Operators)
Operator 符号 | Example 案例 | Is The Same As 等同于 |
---|---|---|
= | x=y | x=y |
+= | x+=y | x=x+y |
-= | x-=y | x=x-y |
*= | x*=y | x=x*y |
/= | x/=y | x=x/y |
%= | x%=y | x=x%y |
Comparison Operators
比较符(Comparison Operators)
Operator 符号 | Description 具体描述 | Example 案例 |
---|---|---|
== | is equal to 等于 |
5==8?返回 false |
!= | is not equal 不等于 |
5!=8 返回? true |
> | is greater than 大于 |
5>8 返回? false |
< | is less than 小于 |
5<8 返回? true |
>= | is greater than or equal to 大于等于 |
5>=8 返回? false |
<= | is less than or equal to 小于等于 |
5<=8 返回? true |
Logical Operators
逻辑判断符(Logical Operators)
Operator 符号 | Description 描述 | Example 案例 |
---|---|---|
&& | and 与 |
x=6 y=3(x < 10 && y > 1)?返回 true |
|| | or 或 |
x=6 y=3(x==5 || y==5)?返回 false |
! | not 非 |
x=6 y=3!(x==y)返回true |