What I have is a form with 45 data fields... if any of a selected 35
of those fields is empty, I want to have the user go back. So I can't
loop over the entire _POST array. So I thought I would put the names
of the fields I *do* want to check into an array and check.

So this won't work:
> foreach($array as $key=>$value){
>   if(empty($value)){
>         $err_msg= "$key is empty";
>         break;

Because the array is the names of the fields, and I want to check each
variable in _POST that matches. So instead of writing

if (empty($_POST['forma'])
if (empty($_POST['formb'])
etc

I would do something like

$fieldstocheck = array('forma', 'formb');

foreach ($fields as $thisfield) {
if (empty($_POST[$thisfield])) {
  set the error flag;
}

But that doesn't seem to work.

Eventually I will use the array to associate error text:
$fieldstocheck = array('forma' => 'You must enter field A', 'formb' =>
''Field B is your age in years and is required');

etc

c

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