source: extensions/oAuth/include/test/examples/social_hub/includes/common.php @ 20293

<?php
//--------------------------------
// Common functions and utilities
//--------------------------------

        // timestamp to relative period
        // http://tutorialzine.com/2009/09/making-our-own-twitter-timeline/
        function timestamp_to_relative_time( $dt )
        {
                $precision = 2;
                $times=array(   365*24*60*60    => "year",
                                30*24*60*60     => "month",
                                7*24*60*60      => "week",
                                24*60*60        => "day",
                                60*60           => "hour",
                                60              => "minute",
                                1               => "second");

                $passed=time()-$dt;

                if($passed<5)
                {
                        $output='less than 5 seconds ago';
                }
                else
                {
                        $output=array();
                        $exit=0;
                        foreach($times as $period=>$name)
                        {
                                if($exit>=$precision || ($exit>0 && $period<60))        break;
                                $result = floor($passed/$period);

                                if($result>0)
                                {
                                        $output[]=$result.' '.$name.($result==1?'':'s');
                                        $passed-=$result*$period;
                                        $exit++;
                                }

                                else if($exit>0) $exit++;

                        }
                        $output=implode(' and ',$output).' ago';
                }

                return $output;
        }

        // format message
        function format_string( $string )
        {
                // url to link
                $string = preg_replace( '/((?:http|https|ftp):\/\/(?:[A-Z0-9][A-Z0-9_-]*(?:\.[A-Z0-9][A-Z0-9_-]*)+):?(\d+)?\/?[^\s\"\']+)/i','<a href="$1" rel="nofollow" target="blank">$1</a>', $string ) ;

        // some stuff for twitter, just to demonstrate ...

                // hashtag to link
                $string = preg_replace('/(^|\s)#(\w*[a-zA-Z_]+\w*)/', '\1<a href="http://twitter.com/search/\2" rel="nofollow" target="blank">#\2</a>', $string );
                
                // @ to link
                $string = preg_replace('/(^|\s)@(\w*[a-zA-Z_]+\w*)/', '\1<a href="http://twitter.com/\2" rel="nofollow" target="blank">@\2</a>', $string );

                return $string;
        }