searching for ' '

[rondog]

How can I check if a user has searched ' ' or '    ' or however many amount of spaces..because right now if I search with just a space, it returns every item in my DB.

[hitman6003]

if ($search_string == "" || str_replace(' ', '', $search_string) == "") {
  echo 'You must enter a search term';
}

[DarkWater]

$trimmed = trim($_POST['search']);  

Something like that.  Then:

if ($trimmed = '') {

  echo "Please enter a search term.";

}

else {

 //SQL stuff

}