PHP 手冊
前一頁 | 章 15. Operators | 下一頁

# Arithmetic Operators

Remember basic arithmetic from school? These work just like those.

表格 15-2. Arithmetic Operators

Example | Name | Result
--- | --- | ---
-$a | Negation | Opposite of $a.
$a + $b | Addition | Sum of $a and $b.
$a - $b | Subtraction | Difference of $a and $b.
$a * $b | Multiplication | Product of $a and $b.
$a / $b | Division | Quotient of $a and $b.
$a % $b | Modulus | Remainder of $a divided by $b.

The division operator ("/") returns a float value anytime, even if the two operands are integers (or strings that get converted to integers).

> 注: Remainder $a % $b is negative for negative $a.

See also the manual page on Math functions.

前一頁 | 內容 | 下一頁
Operators | 上一層 | Assignment Operators