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Unary Operators◄╣

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Unary Operators (Perl and PHP Cross Reference Guide)

By Mike Prestwood

Perl versus PHP: A side by side comparison between Perl and PHP.

Operators

A language symbol used for assignment, comparison, computational, or as a logical.

Unary Operators

[Other Languages]

General Info: Unary Operator

An operation with only one operand (a single input). Common unary operators include + plus, - minus, and bitwise not. Some operators can function as both unary and binary operators. For example, + and - operators can serve as either.

Languages Focus

What unary operators are supported in additoin to the standard plus, minus, and bitwise not.

Perl:

An operation with only one operand (a single input). The following are the Perl unary operators: !, -, ~, +, \, &, and *.

! performs logical negation which is "not"
- performs arithmetic negation if the operand is numeric.
~ performs bitwise negation, that is 1's complement.
+ has no semantic effect whatsoever, even on strings.
\ creates a reference to whatsoever follows.
& Address of operator.
* Dereference address operator.

Perl Unary Operators

PHP:

A unary operator operates on only one value.

PHP Examples:

! negation operator
++ increment operator
-- decrement operator

PHP Unary Operators