If ($variable in $setofvariables)......

[nesvarbu]

$setofvariables = "k1, k2, k3, k4, k5, k6, k7, k8, k9, egz";
                   if ($_POST[select] in $setofvariables)
                       {...}

The problem is that if statement doesnt have such operator 'in'. So my question is whats equivalent to operator 'in'?

[paulnaj]

There are probably a few ways to solve this; here's one, using in_array ...

$setofvariables = "k1, k2, k3, k4, k5, k6, k7, k8, k9, egz";

// Split the string into an array
$arrofvariables = explode(", ", $setofvariables);

if(in_array($_POST[select], $arrofvariables)){
   // Do something ...
}

[Weedpacket]

It might be more convenient to store the set of variables as an array in the first place, save all that exploding:

$setofvariables = array('k1','k2','k3','k4','k5','k6','k7','k8','k9','egz');
if(in_array($_POST['select'], $setofvariables))
{...
}

And of course is this is the only place the array is used you may not need the extra variable:

if(in_array($_POST['select'], array('k1','k2','k3','k4','k5','k6','k7','k8','k9','egz'))
{...
}

"if in array..." sound like what you're after?