Question

I have been looking for a way to create a function to check if a string contains anything other than lower case letters and numbers in it, and if it does return false. I have searched on the internet but all I can find is old methods that require you to use functions that are now deprecated in PHP5.

Answer 1

function check_input( $text ) {
  if( preg_match( "/[^a-z0-9]/", $text ) ) {
    return false;
  }
  else {
    return true;
  }
}