function trimExtraChars($string, $max = 100, $tail = '...') {	
	if (strlen($string) > $max) {
		$string = substr($string, 0, $max) . $tail;
	}
	
	return $string;
}

http://www.bluecapwebdesign.com

If a string exceeds x characters (defaults to 100), trims the string to the first x characters and appends a tail to the end of the truncated string (defaults to an ellipsis).

Trim extra characters from string (truncate string)

php

PHP