How to check if string is in array with php?

I have an array that looks like the following when var_dump:

 array(3) { [0]=> array(3) { ["id"]=> string(1) "3" ["category"]=> string(5) "staff" ["num_posts"]=> string(1) "1" } [1]=> array(3) { ["id"]=> string(1) "1" ["category"]=> string(7) "general" ["num_posts"]=> string(1) "4" } [2]=> array(3) { ["id"]=> string(1) "2" ["category"]=> string(6) "events" ["num_posts"]=> string(1) "1" } }

I need to echo a value if the array does not contain the following string: ‘hello’

How is this possible, I have tried using in_array, but unsuccessfully. Help appreciated.

Answer

foreach ($array as $subarray)
{
   if(!in_array('hello', $subarray))
   {
      echo 'echo the value';
   }
}