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Try following example to understand all the logical operators. Copy and paste following PHP program in test.php file ando keep it in your PHP Server's document root and browse it using any browser.
<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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