How to get the answer to this sum

[Irresistable]

I have some variables set, and I'm trying to find the answer of them... but it doesn't work.

$pri = 1

$met = +

$sec = 1

 

$answer = $pri . $met . $sec;

The sum techncially is 1+1 Why isn't $answer 2?

[premiso]

Because you are just concatenating a string. As far as I know the only way to do what you want is something like this:

 

$pri = 1;
$met = '+';
$sec = 1;

switch ($met) {
    case '+':
        $answer = $pri + $sec;
    break;
    case '-':
        $answer = $pri - $sec;
    break;
}

 

You may be able to use eval but I would suggest against it. Here is how that would be done:

 

eval('$answer = $pri ' . $met . ' $sec');
echo $answer;

 

If you go that route make sure to filter your data, as eval can be dangerous if the data going into it is not checked / validated / filtered.

[Irresistable]

Parse error: syntax error, unexpected '=' in /home/jeanie/public_html/recaptcha/pngimg.php on line 51

sum = "$pri + $met =";

 

How do I solve it ?

[ignace]

Don't double post you already have a thread about this http://www.phpfreaks.com/forums/index.php/topic,282626.msg1339975.html#msg1339975

[premiso]

Use correct syntax.

 

$sum = "$pri + $met =";

 

[Irresistable]

Hmm.. I'm sorry. I didn't quite see it as a double post.

Yeah sorry. That was a common typo I didn't notice.