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PHP Manual

This manual is provided as a courtesy. It is not an official source. Please check php.net for updated information.

PHP Manual

PHP Manual
PHP Manual
PrevChapter 15. OperatorsNext

Arithmetic Operators

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

Table 15-2. Arithmetic Operators

ExampleNameResult
-$aNegationOpposite of $a.
$a + $bAdditionSum of $a and $b.
$a - $bSubtractionDifference of $a and $b.
$a * $bMultiplicationProduct of $a and $b.
$a / $bDivisionQuotient of $a and $b.
$a % $bModulusRemainder 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).

Note: Remainder $a % $b is negative for negative $a.

See also the manual page on Math functions.

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