释放双眼，带上耳机，听听看~！
**4 PHP运算符
**
本部分列出了在
PHP 中使用的各种运算符：
算数运算符****
| 运算符 | 说明 | 例子 | 结果 |
| + | Addition | x=2 x+2 | 4 |
| – | Subtraction | x=2 5-x | 3 |
| * | Multiplication | x=4 x*5 | 20 |
| / | Division | 15/5 5/2 | 3 2.5 |
| % | Modulus (division remainder) | 5%2 10%8 10%2 | 1 2 0 |
| ++ | Increment | x=5 x++ | x=6 |
| — | Decrement | x=5 x– | x=4 |
1 | 1 |
赋值运算符****
| 运算符 | 说明 | 例子 |
| = | 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 |
| %= | x%=y | x=x%y |
1 | 1 |
比较运算符****
| 运算符 | 说明 | 例子 |
| == | is equal to | 5==8 returns false |
| != | is not equal | 5!=8 returns true |
| > | is greater than | 5>8 returns false |
| < | is less than | 5<8 returns true |
| >= | is greater than or equal to | 5>=8 returns false |
| <= | is less than or equal to | 5<=8 returns true |
1 | 1 |
逻辑运算符****
| 运算符 | 说明 | 例子 |
| && | and | x=6 y=3 (x < 10 && y > 1) returns true |
| || | or | x=6 y=3 (x==5 || y==5) returns false |
| ! | not | x=6 y=3 !(x==y) returns tru |
1 | 1 |
