Logical Operators or Relational Operators
The table below
lists logical operators along with description and examples.
In the examples
below A = 10 and B = 20.
Example:
script:
Logical_op.php
<html>
<head> <title>Logical Operators</title></head>
<body>
<?php
$a = 22;
$b = 0;
echo
"a=".$a."</br>"; echo
"b=".$b."</br>";
if( $a &&
$b ){ echo "AND : Both a and b are true<br/>";
}else{
echo "AND :
Either a or b is false<br/>";
}
if( $a and $b ){
echo "AND1 :
Both a and b are true<br/>";
} else{
echo “ANDI :
Either a or b is false<br/>";
}
if( $a II $b ){
echo "OR :
Either a or b is true<br/>";
}else{
echo "OR :
Both a and b are false<br/>";
}
if( $a or $b ){
echo "OR1 :
Either a or b is true<br/>";
}else{
echo "OR1 :
Both a and b are false <br/>”;
}
$a = 10;
$b = 20;
echo
"a=".$a."</br>";
echo
"b=".$b."</br>";
if( $a ){
echo "Value
a : a is true <br/>";
} else{
echo "value
a: a is false<br/>";
}
if( $b ){
echo "Value
b : b is true <br/>";
} else{
echo "Value
b : b is false<br/>";
}
if( !$a ){
echo "Value
NOT a : a is true <br/>";
} else{
echo "value value
NOT a: a is false<br/>";
}
if( !$b ){
echo "value
NOT b : b is true <br/>";
}else{
echo " value
NOT b: b is false<br/>";
}
?>
</body>
</html>
OUTPUT:
a=22
b=0;
AND : Either a or
b is false
AND1 : Either a
or b is false
OR : Either a or
b is true
OR1 : Either a or
b is true
a = 10
b=20 Value a: a
is true
Value b:b is true
Value NOT a: a is
false
Value NOT b: b is
false
