question with xor operator

i57chevy

Working through a tutorial and I can't figure out how to make "Both can't win!" display. Can anyone explain this to me. Seems like it should be simple enough. Thanks.

$contestant_one='best teeth';
$contestant_two='best ears';

if($contestant_one xor $contestant_two){
print("Both can't win!");
}

else{
print('Only one winner!');
}

jeepin81

That is because 'Xor' is looking for a boolean value. See the the manual on logical operators.

i57chevy

thank you. wonder why they wrote the code like this. I know that it's just an example, but.......

NogDog

<?php

$contestant_one='best teeth';
$contestant_two='best ears';

if($contestant_one xor $contestant_two){
	print("We have just one winner.");
}

else{
	print("Both can't win!");
}

echo "\r\n----------\r\n";

$contestant_one='best teeth';
$contestant_two='';

if($contestant_one xor $contestant_two){
	print("We have just one winner.");
}

else{
	print("Both can't win!");
}

Output:

Both can't win!
----------
We have just one winner.

PS: Note that the "both can't win" message would also display if both variables were empty, so the message could be misleading in this case.

i57chevy

well, I don't see how xor would be very useful in this case. How would you be able to use xor to test two variables where you would only have one winner. Am I missing the point? The above code is taken right out of the tutorial.

i57chevy

ok. This makes sense:

$contestant_one="winner";
$contestant_two="loser";

if($contestant_one=="winner" xor $contestant_two=="winner"){
print("I won!");
}

else{
print('Only one winner!');
}

Weedpacket

The original code is rubbish; without context I can't say whether that reflects on the quality of the tutorial.