<?php
	$text = "left right\r\nbottom";
    function clean($text) {
    	$text = preg_replace('/[\cK\f\r\x85]+/', '', $text);
    	$text = preg_replace('/\h+/', ' ', $text);
    	return  $text;
    }
    //compare before and after clean
    var_dump(json_encode($text));
    $text = clean($text);
    var_dump(json_encode($text));