isset

[westminster86]

is there a way of checking all my variables have a value. I know about using the isset function

 

e.g if (isset($_post['value']))

 

 

can i write a single statement that sees if all my variables have values?

 

 

or do i have to write them out as ive given above one by one?

[The Little Guy]

try using empty() instead

[Trium918]

Try this!

<?php
   // check forms filled in
   if (!filled_out($_POST)) 
   {
      echo "You have not filled the form out correctly - please go back"
           ." and try again.";
      exit; 
   } 

function filled_out($form_vars)
{
  // test that each variable has a value
  foreach ($form_vars as $key => $value)
  {
     if (!isset($key) || ($value == "")) 
        return false;
  } 
  return true;
}
?>

[discomatt]

Uhhh, there's no way to do that. The only way to do that is if you store all your variable names into an array, then use a foreach to iterate through the array and check each one

 

There's no way for PHP to know what vars you want/don't want without telling it which ones are supposed to be there

[The Little Guy]

another good thing to do, would be to remove all spaces, and make sure that there are numeric and non-numeric values entered, because with empty, it looks to see if there is anything in the string, and a space does count so it will then return true.

 

isset only checks to see if a variable is set, not if the variable holds anything.

 

Example 1:

<?php
$cat = "";
isset($cat); // returns true
?>

 

Example 2:

<?php
$dog = "123121";
isset($dog); // returns true
?>

 

Example 3:

<?php
$dog = "123121";
isset($bird); // returns false
?>

[discomatt]

When dealing with POST variables, if the input is empty, the array key will not be created. I've never seen it act differently

[The Little Guy]

it gets created.... it just is blank it would look like this, where fish is the empty value:

 

cat=1&dog=2&fish=&bird=3

[discomatt]

As i said, when dealing with POST variables. The method you highlighted would be GET

[The Little Guy]

That is how a POST looks too when you look at the headers.