Logical Operators
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Logical Operators

Defining conditions is the essential part of programming. Your skill to define the conditions tell your programming expertise to others. To define conditions using if else and switch case statement, we require logical operators.

Operator 'and'

This operator returns true if both conditions are true.

See below example-

<?php
$x = 6;
$y = 7;
if($x == 6 and $y == 7)
	{
	echo "Both conditions are true.";
	}
?>

Output:

Both conditions are true.


Operator 'OR'

This operator returns true if any one condition is true,

<?php
$x = 6;
$y = 7;
if($x == 6 or $y == 10){
	echo "One condition is true.";
	}
?>

Output:

One condition is true.

enlightenedWe can use '&&' instead of 'and' and '||' instead of 'or'. Both have same functionalities but when you will code for too many conditions then '&&' and '||' will provide accurate result due to their precedence.


Operator '!'

This operator returns true if condition is false. So we can say that it return the opposit value of its operand.

See below example-

<?php
$x = 6;
if($x != 5){
	echo "Value of variable x was 6, not 5.";
	}
?>

Output:

Value of variable x was 6, not 5.


Operator 'Xor'

This operator returns true if any one condition become true but not both.

See below example-

<?php
$x = 6;
$y = 7;
if($x == 6 xor $y == 10){
	echo "Only one condition is true.";
	}
?>

Output:

Only one condition is true.

 

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String Operators

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