Cut string, reflect words delimited by space, cuts some ugly chars from the end

cut.everything.php

<?php
	/**
	* Cut string, reflect words delimited by space, cuts some ugly chars from the end
	* @param string $str
	* @param int $length
	* @return string
	*/
	function cutStr($str, $length = 255, $suffix = NULL){ 
	
		// printable, formal, to samy co nad tim, jen jinak psany
		// $str = mb_ereg_replace( '[^[:print:]]', '', self::autoUTF( $str ) );  
		
		$str = trim(strip_tags($str));
		$str = trim($str, ',.');

		if (mb_strlen($str)<=$length) { 
			return $str; 
		} 

		$str = mb_substr($str, 0, $length); 

		$pos = mb_strrpos($str, " "); 
		$str = $pos>1 ? mb_substr( $str, 0, $pos ): $str; 
		$str = trim($str, '-, ');

		// short last word
		$wordLimit = 4;
		$words = explode( ' ', $str );
		$lastPos = count( $words ) - 1;
		$lastWordLength = mb_strlen( $words[$lastPos] );

		if( $lastWordLength < $wordLimit ){
			$str = mb_substr( $str, 0, -($lastWordLength+1) );
		}

		return $str.$suffix; 
	}
	
?>