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<?php

function removeChars( $string ) {

  // keep white space
  return preg_replace('/[^a-zA-Z0-9\s]/', '', $string);

  // remove white space
  return preg_replace('/(W)+/', '', $string);

  // remove words shorter than 3 characters - doesn't work with multibyte characters (š, č...)
  return preg_replace('~b[a-z]{1,2}bs*~', '', $string);
  
}

// remove words shorter than 3 characters - works with multibyte characters (š, č...)
$maxWordLength = 3;
$string = "Volvo en  če da BMW ti motor 77 še Toyota";
$exploded = explode(" ", $string);
foreach($exploded as $key => $word) {
  if(mb_strlen($word) < $maxWordLength) unset($exploded[$key]);
}
$string = implode(" ", $exploded);
echo $string;