A simple class with some static helpfunctions

helpfunctions.class.php

<?php
    class HelpFunctions
    {
        /**
         * Get the relative time between now and a given timestamp
         * @param string $timestamp
         * @return string
         */
        static function relativeTime($timestamp)
        {
            $diff = time() - strtotime($date);
        
            if ($diff<60)
                return ('mindre än en minut sedan');
            else if ($diff < 120)
                return ('en minut sedan');
            else if ($diff < (60*60))
                return (round($diff/60).' minuter sedan');
            else if ($diff < (120*60))
                return ('ungefär en timme sedan');	
            else if ($diff < (24*60*60))
                return ('ungefär '.round($diff/3600).' timmar sedan');
            else if ($diff < (48*60*60))
                return ('1 dag sedan');
            else
                return (round($diff/86400).' dagar sedan');            
        }
        /**
         * Get the IP address of the visitor
         * @return string
         */
        static function getIp()  
        {  
            if (!emptyempty($_SERVER['HTTP_CLIENT_IP']))  
            {  
                $ip=$_SERVER['HTTP_CLIENT_IP'];  
            }  
            elseif (!emptyempty($_SERVER['HTTP_X_FORWARDED_FOR']))  
            //to check ip is pass from proxy  
            {  
                $ip=$_SERVER['HTTP_X_FORWARDED_FOR'];  
            }  
            else  
            {  
                $ip=$_SERVER['REMOTE_ADDR'];  
            }  
            return $ip;  
        }
        /**
         * Creates an excerpt, perfect for teasers etc.
         * @param string $string
         * @param int $limit
         * @param string $break
         * @param string $pad
         * @return string
         */
        static function truncateString($string, $limit, $break=".", $pad="...") {  
            // return with no change if string is shorter than $limit  
            if(strlen($string) <= $limit)  
                return $string;   
          
            // is $break present between $limit and the end of the string?  
            if(false !== ($breakpoint = strpos($string, $break, $limit))) {  
                if($breakpoint < strlen($string) - 1) {  
                    $string = substr($string, 0, $breakpoint) . $pad;  
                }  
            }  
            return $string;  
        }
        /**
         * Convert URLs within strings into hyperlinks
         * @param string $text
         * @return string $text
         */
        static function makeClickableLinks($text) {  
            $text = eregi_replace('(((f|ht){1}tp://)[-a-zA-Z0-9@:%_+.~#?&//=]+)',  
            '<a href="\1">\1</a>', $text);  
            $text = eregi_replace('([[:space:]()[{}])(www.[-a-zA-Z0-9@:%_+.~#?&//=]+)',  
            '\1<a href="http://\2">\2</a>', $text);  
            $text = eregi_replace('([_.0-9a-z-]+@([0-9a-z][0-9a-z-]+.)+[a-z]{2,3})',  
            '<a href="mailto:\1">\1</a>', $text);               
           return $text;  
        }          
    }
?>