[SOLVED] Either or but not both

[soycharliente]

How would you test if only one of something is empty but not both? This doesn't seem to be working.

 

<?php
$dollars = $_POST['dollars'];
$cents = $_POST['cents'];
$errors .= (empty($dollars) || empty($cents))
? "<br /><span class=\"error\">Check the price.</span>"
: FALSE;
?>

[haku]

if((empty($dollars) && !empty($cents)) || (empty($cents) && !empty($dollars))

 

[Maq]

Use XOR

[soycharliente]

Is XOR the same as ^?

[Maq]

Is XOR the same as ^?

 

Did you read the link:

 

Explanation:

 

An exclusive OR only evaluates to TRUE when exactly one operand is TRUE.

[haku]

That's what I like about this site - there is always something else to learn. XOR is new to me, but I will definitely use it in the future. Much shorter than what I posted.

[Philip]

Is XOR the same as ^?

 

Did you read the link:

 

Explanation:

 

An exclusive OR only evaluates to TRUE when exactly one operand is TRUE.

 

To extend your explanation, yes XOR is the same as ^.... but ^ is on the bitwise level, whereas XOR is a normal logical operator for any non-bitwise comparisons.

 

Bitwise:

echo "hallo" ^ "hello"; // Outputs the ascii values #0 #4 #0 #0 #0
// 'a' ^ 'e' = #4

 

Comparison, normal use:

if(!$var XOR !$var2) {
// if one is false and other is not false, but not both

[soycharliente]

Did you read the link:

 

Yes I did. Then went and did some more research on my own and came back with another question.

[Maq]

Did you read the link:

 

Yes I did. Then went and did some more research on my own and came back with another question.

 

My apologies, I thought by '^' you were pointing towards Haku's post.  KingPhilip has posted a good explanation.   

[haku]

I thought he was pointing at my post too