php常用操作符
最常见的PHP赋值运算，算术运算符，联合经营，比较运算符和逻辑运算符。每个类型分别讨论如下。
赋值运算符
在PHP基本赋值运算符是“=”。这意味着，左边的操作数“=”获取设置为值的右侧“=”。
算术运算符
| Operator | Example | Result |
| + | 4 + 2 | 6 |
| - | 4 - 2 | 2 |
| * | 4 * 2 | 8 |
| / | 4 / 2 | 2 |
| % | 4 % 2 | 0 |
| ++ | x = 4; x++; | x = 5 |
| -- | x = 4; x--; | x = 3 |
联合运营商
你可以结合赋值运算符算术运算符组成一个联合运营商。联合运营商如下：
| Operator | Example | Meaning |
| += | y += x | y = y + x |
| -= | y -= x | y = y - x |
| *= | y *= x | y = y * x |
| /= | y /= x | y = y / x |
| %= | y %= x | y = y % x |
比较运算符
| Operator | Meaning |
| == | is equal to |
| != | is not equal to |
| > | is greater than |
| >= | is greater than or equal to |
| < | is less than |
| <= | is less than or equal to |
逻辑运算符
| Operator | Meaning |
| || | or |
| && | and |
| and | and |
| or | or |
| xor | xor |
| ! | not |
补充：Php教程,Php入门 
