Testing Operands

busman posted this at 22:10 — 17th June 2009.

Joined: Dec 2008

Please could you tell me why this is not echo(ing) on to my page?

<?php
    $a = true;
    $b = false;
    
    #test both operands for true (&& = and)
    $test1 = ($a && $a)? "true","false";
    $test2 = ($a && $b)? "true","false";
    $test3 = ($b && $b)? "true","false";
    
    #test either operand for TRUE (|| = or)
    $test4 = ($a || $a)? "true","false";
    $test5 = ($a || $b)? "true","false";
    $test6 = ($b || $b)? "true","false";
    
    #test for single operand is TRUE 
    $test7 = ($a xor $a)? "true","false";
    $test8 = ($a xor $b)? "true","false";
    $test9 = ($b xor &b)? "true","false";
    
    #invert values ( ! = NOT )
    $test10 = ( !$a )? "true","false";
    $test11 = ( !$b )? "true","false";
    
    $result  = "AND Operand - 1:$test1 2:$test2 3:$test3<br/><br/>";
    $result .= "OR Operand - 1:$test4 2:$test5 3:$test6<br/><br/>";
    $result .= "XOR Operand - 1:$test7 2:$test8 3:$test9<br/><br/>";
    $result .= "NOT Operand - 1:$test10 2:$test11";
    
?>

Untitled Document

<?php
  echo($result); 
?>

teammatt3 posted this at 23:31 — 17th June 2009.

He has: 2,102 posts

Joined: Sep 2003

You're testing with the ternary operator. Its syntax is:

(condition) ? (true event) : (false event)

It looks like you're using a comma instead of a colon in your code.

busman posted this at 11:59 — 18th June 2009.

They have: 20 posts

Joined: Dec 2008

I have uploaded the changes to the code and still it will not echo?

<?php
    $a = true;
    $b = false;
    
    #test both operands for true (&& = and)
    $test1 = ($a and $a)? "true":"false";
    $test2 = ($a and $b)? "true":"false";
    $test3 = ($b and $b)? "true":"false";
    
    #test either operand for TRUE (|| = or)
    $test4 = ($a or $a)? "true":"false";
    $test5 = ($a or $b)? "true":"false";
    $test6 = ($b or $b)? "true":"false";
    
    #test for single operand is TRUE 
    $test7 = ($a xor $a)? "true":"false";
    $test8 = ($a xor $b)? "true":"false";
    $test9 = ($b xor &b)? "true":"false";
    
    #invert values ( ! = NOT )
    $test10 = ( !$a )? "true":"false";
    $test11 = ( !$b )? "true":"false";
    
    $result  = "AND Operand - 1:$test1 2:$test2 3:$test3<br/><br/>";
    $result .= "OR Operand - 1:$test4 2:$test5 3:$test6<br/><br/>";
    $result .= "XOR Operand - 1:$test7 2:$test8 3:$test9<br/><br/>";
    $result .= "NOT Operand - 1:$test10 2:$test11";
    
?>

Untitled Document

<?php
  echo($result); 
?>

Thanks

teammatt3 posted this at 14:36 — 18th June 2009.

He has: 2,102 posts

Joined: Sep 2003

<?php
    $test9 = ($b xor &b)? "true":"false"; 
?>

&b needs to be $b