Logical Operators:


There are following logical operators supported by PHP language

Assume variable A holds 10 and variable B holds 20 then:

Show Examples

Operator Description Example
and Called Logical AND operator. If both the operands are true then then condition becomes true. (A and B) is true.
or Called Logical OR Operator. If any of the two operands are non zero then then condition becomes true. (A or B) is true.
&& Called Logical AND operator. If both the operands are non zero then then condition becomes true. (A && B) is true.
|| Called Logical OR Operator. If any of the two operands are non zero then then condition becomes true. (A || B) is true.
! Called Logical NOT Operator. Use to reverses the logical state of its operand. If a condition is true then Logical NOT operator will make false. !(A && B) is false.

PHP Logical Operators Example

<html>
<head><title>Logical Operators</title><head>
<body>
<?php
    $a = 42;
    $b = 0;

    if( $a && $b ){
       echo "TEST1 : Both a and b are true<br/>";
    }else{
       echo "TEST1 : Either a or b is false<br/>";
    }
    if( $a and $b ){
       echo "TEST2 : Both a and b are true<br/>";
    }else{
       echo "TEST2 : Either a or b is false<br/>";
    }
    if( $a || $b ){
       echo "TEST3 : Either a or b is true<br/>";
    }else{
       echo "TEST3 : Both a and b are false<br/>";
    }
    if( $a or $b ){
       echo "TEST4 : Either a or b is true<br/>";
    }else{
       echo "TEST4 : Both a and b are false<br/>";
    }
    $a = 10;
    $b = 20;
    if( $a ){
       echo "TEST5 : a is true <br/>";
    }else{
       echo "TEST5 : a  is false<br/>";
    }
    if( $b ){
       echo "TEST6 : b is true <br/>";
    }else{
       echo "TEST6 : b  is false<br/>";
    }
    if( !$a ){
       echo "TEST7 : a is true <br/>";
    }else{
       echo "TEST7 : a  is false<br/>";
    }
    if( !$b ){
       echo "TEST8 : b is true <br/>";
    }else{
       echo "TEST8 : b  is false<br/>";
    }
?>
</body>
</html>

This will produce following result

TEST1 : Either a or b is false
TEST2 : Either a or b is false
TEST3 : Either a or b is true
TEST4 : Either a or b is true
TEST5 : a is true
TEST6 : b is true
TEST7 : a is false
TEST8 : b is false

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