Logical Operators


logical operator is a symbol or word used to connect two or more expressions such that the value of the compound expression produced depends only on that of the original expressions and on the meaning of the operator.[1] Common logical operators include AND, OR, and NOT.

logical operation is a special symbol or word that connects two or more phrases of information. It is most often used to test whether a certain relationship between the phrases is true or false.

What are the different types of logical operators?

These logical operators are used to compare two values of the same type.

  • true. to the first expression and . false. to the second;
  • false. to the first expression and . true. to the second; and,
  • false. to both statements.

Fundamental logic operations

The following seven logic operations take inputs that are either true (1) or false (0) and produce a single output value that is also true or false.

Most of these operations can take more than two inputs, except for the NOT operation which takes only one input. Below are examples using only one or two inputs, which is what usually happens inside a computer.

The operations are listed below. Click a link for an operation to learn more.

Which are the logical operators in PHP?

xorXor$x xor $y
&&And$x && $y
||Or$x || $y

How are logical operators used?

Logical operators are used in logical and arithmetic comparisons, and they return TRUE (i.e., logical 1) if the expression evaluates to nonzero or FALSE (i.e., logical 0) if the expression evaluates to zero.

Why are logical operators important?

Logical operators are very important in any programming language and they help us take decisions based on certain conditions. Suppose we want to combine the result of two conditions, then logical AND and OR logical operators help us in producing the final result. Called Logical AND operator.

What are the advantages of using Boolean operators?

  • Boolean Operators: And, Or, Not.
  • Allows us to broaden our search by adding like terms (using “or”)
  • Allows us to narrow our search by searching more than one topic at a time (using “and”)
  • Allows us to eliminate unwanted results (using “not”)

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