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function clean_string($string) {
   $string = str_replace(' ', '-', $string); // Replaces all spaces with hyphens.

   return preg_replace('/[^A-Za-z0-9\-]/', '', $string); // Removes special chars.
}
//echo clean('SKDKFJDFJKDJK!@#$%^&*()-adfkjkdfjkdfjDffd String');