检查数组是否存在？

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

Try array_key_exists to see if it exists.

if( isset($option['color'][$key]) )
{
  $_SESSION[$key]['option']['color'] = $option['color'][$key];
}

if it is always 0,1,2 or any line of consecutive integers you could do if(count($option['color']) > $key ){}

use isset or empty.

• http://php.net/manual/en/function.isset.php
• http://us2.php.net/manual/en/function.empty.php

for example:

if (isset($array['idx'])){ ... }
if (!empty($array['idx'])){ ... }

isset($option['color'][$key]) is the way to go.

Check the exact line of code the error occurs when you still get it using isset().