检查数组是否存在？

Question

There is post of select form like:

<select name="option[color][0]">
<select name="option[color][1]">
// option[color][2] isnt posted

Some products doesnt have that select, and then when I try to get them from post, each time if select isn't posted, im getting error like:

Undefined offset: 2

How to check if something is posted? Tried:

$ids       = $_POST['id'];
$option = $_POST['option'];

foreach ($ids as $key => $id)
{
   //Undefined offset: 2
   if( $option['color'][$key] )
   {
      $_SESSION[$key]['option']['color'] = $option['color'][$key];
   }

   //Undefined offset: 2
   if( !empty($option['color'][$key]) )
   {
      $_SESSION[$key]['option']['color'] = $option['color'][$key];
   }

   //Undefined offset: 2
   if( isset($option['color'][$key]) )
   {
      $_SESSION[$key]['option']['color'] = $option['color'][$key];
   }

   //... etc
}

Etc.... what ever I try, there is error :( Please help

Answer 1

Try array_key_exists to see if it exists.