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运算符用于对值进行运算.
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 |
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 |
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 |
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 true |
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