Syntax: checking if multiple variables are set

[lightnb]

I want a bit of code to run if $HD is set, $VD is also set, and $TD is NOT set.

Is there an easy way to do this?

I'm guessing it would be somthing like:

PHP Code:

if( isset( $GT2 and $VD !and $TD) ) {solve for $TD, and set $TD = the answer}; 


Th PHP manual only gives an example of isset with one variable. Any help would be appreciated.

thanks,

Nick

[Paul M]

More like ;

PHP Code:

if ( isset($GT2) and isset($VD) and !isset($TD) ) 


[lightnb]

Thanks

Is this valid code to set $C equal to $A squared plus $B squared?

PHP Code:


if ( isset($A) and isset($B) and !isset($C) ) {$C=sqrt(($A*$A)+($B*$B));} 


[Paul M]

Um, did you mean set $C to the Square Root of $A squared plus $B squared

[lightnb]

yeah, that was a typo...

I'm trying to calculate pythagreom therum. (sp?)

[Paul M]

Then yes, it looks valid.

[Adrian Schneider]

Yep! Personally I would pow(X, 2) to square it, but that doesn't matter. I gave it a trial run with 3, 4, and 5:

PHP Code:

<?php

$A = 3;
$B = 4;

if (isset($A) and isset($B) and !isset($C))
{
    $C = sqrt(pow($A, 2) + pow($B, 2));
}

echo $C;

?>

Both methods gave the desired result of 5.

[lightnb]

Thanks

Do you know if there's a command to check and see if any two variables out of a whole bunch of them isset?

[Adrian Schneider]

I highly doubt there is, but here is a quick one I wrote:

PHP Code:

<?php

function atLeastTwo($values)
{
    $counter = 0;
    foreach ($values as $value)
    {
        if ($value !== null)
        {
            $counter++;
            if ($counter == 2)
            {
                return true;
            }
        }
    }
    return false;
}

$a = 1;
$b = 2;

$values = @array($a, $b, $c);

if (atLeastTwo($values))
{
    echo "Woot!  At least two are set!";
}
else
{
    echo "Phooey!  Less than two are set!";
}

?>

Just load the values into an array and pass it to the funtion, it will return the boolean result.

[lightnb]

Thanks.

Does this work:

PHP Code:

//we place all the values into an array so we can run a function on them

$values = @array($HD, $VD, $TD, $Dv, $Dh, $PC, $FC, $V, $A, $W, $FA, $MFv, $MFh, $GT1, $GT2);


//we check to see if the user has filled in at least two variables

function atLeastTwo($values)
{
    $counter = 0;
    foreach ($values as $value)
    {
        if ($value !== null)
        {
            $counter++;
            if ($counter == 2)
            {
                return false;
            }
        }
    }
    return true;
}



if (atLeastTwo($values))
{
    die "You Must fill in at least two fields before calculating";
}