PHP - Logical Operators Example


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Try following example to understand all the logical operators. Copy and paste following PHP program in test.php file and 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 the 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

php_operator_types.htm

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