[Phpgroupware-cvs] calendar/date_functions.php, 1.1.2.1

[nomail]

Update of /calendar
Added Files:
        Branch: proposal-branch
          date_functions.php

date: 2004/04/16 21:22:00;  author: seek3r;  state: Exp;  lines: +211 -0

Log Message:
bringing savannah cvs back up to date with what we were doing on our private 
cvs server. We will not be doing dev from this cvs tree
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No syntax errors detected in -
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<?php
// date_functions.php
// functions for returning or comparing dates

// not a date function, but I didn't know where to put it
// for backwards compatibility
if (phpversion() < '4.1') {
        function array_key_exists($key, $arr) {
                if (!is_array($arr)) return false;
                foreach (array_keys($arr) as $k) {
                        if ("$k" == "$key") return true;
                }
                return false;
        }
}

// takes iCalendar 2 day format and makes it into 3 characters
// if $txt is true, it returns the 3 letters, otherwise it returns the
// integer of that day; 0=Sun, 1=Mon, etc.
function two2threeCharDays($day, $txt=true) {
        switch($day) {
                case 'SU': return ($txt ? 'sun' : '0');
                case 'MO': return ($txt ? 'mon' : '1');
                case 'TU': return ($txt ? 'tue' : '2');
                case 'WE': return ($txt ? 'wed' : '3');
                case 'TH': return ($txt ? 'thu' : '4');
                case 'FR': return ($txt ? 'fri' : '5');
                case 'SA': return ($txt ? 'sat' : '6');
        }
}

// dateOfWeek() takes a date in Ymd and a day of week in 3 letters or more
// and returns the date of that day. (ie: "sun" or "sunday" would be acceptable 
values of $day but not "su")
function dateOfWeek($Ymd, $day) {
        global $week_start_day;
        if (!isset($week_start_day)) $week_start_day = 'Sunday';
        $timestamp = strtotime($Ymd);
        $num = date('w', strtotime($week_start_day));
        $start_day_time = strtotime((date('w',$timestamp)==$num ? 
"$week_start_day" : "last $week_start_day"), $timestamp);
        $ret_unixtime = strtotime($day,$start_day_time);
        $ret_unixtime = strtotime('+12 hours', $ret_unixtime);
        $ret = date('Ymd',$ret_unixtime);
        return $ret;
}

// function to compare to dates in Ymd and return the number of weeks 
// that differ between them. requires dateOfWeek()
function weekCompare($now, $then) {
        global $week_start_day;
        $sun_now = dateOfWeek($now, $week_start_day);
        $sun_then = dateOfWeek($then, $week_start_day);
        $seconds_now = strtotime($sun_now);
        $seconds_then =  strtotime($sun_then);
        $diff_seconds = $seconds_now - $seconds_then;
        $diff_minutes = $diff_seconds/60;
        $diff_hours = $diff_minutes/60;
        $diff_days = round($diff_hours/24);
        $diff_weeks = $diff_days/7;
        
        return $diff_weeks;
}

// function to compare to dates in Ymd and return the number of days 
// that differ between them.
function dayCompare($now, $then) {
        $seconds_now = strtotime($now);
        $seconds_then =  strtotime($then);
        $diff_seconds = $seconds_now - $seconds_then;
        $diff_minutes = $diff_seconds/60;
        $diff_hours = $diff_minutes/60;
        $diff_days = round($diff_hours/24);
        
        return $diff_days;
}

// function to compare to dates in Ymd and return the number of months 
// that differ between them.
function monthCompare($now, $then) {
        ereg ("([0-9]{4})([0-9]{2})([0-9]{2})", $now, $date_now);
        ereg ("([0-9]{4})([0-9]{2})([0-9]{2})", $then, $date_then);
        $diff_years = $date_now[1] - $date_then[1];
        $diff_months = $date_now[2] - $date_then[2];
        if ($date_now[2] < $date_then[2]) {
                $diff_years -= 1;
                $diff_months = ($diff_months + 12) % 12;
        }
        $diff_months = ($diff_years * 12) + $diff_months;

        return $diff_months;
}

function yearCompare($now, $then) {
        ereg ("([0-9]{4})([0-9]{2})([0-9]{2})", $now, $date_now);
        ereg ("([0-9]{4})([0-9]{2})([0-9]{2})", $then, $date_then);
        $diff_years = $date_now[1] - $date_then[1];
        return $diff_years;
}

// localizeDate() - similar to strftime but uses our preset arrays of localized
// months and week days and only supports %A, %a, %B, %b, %e, and %Y
// more can be added as needed but trying to keep it small while we can
function localizeDate($format, $timestamp) {
        global $daysofweek_lang, $daysofweekshort_lang, 
$daysofweekreallyshort_lang, $monthsofyear_lang, $monthsofyear_lang, 
$monthsofyearshort_lang;
        $year = date("Y", $timestamp);
        $month = date("n", $timestamp)-1;
        $day = date("j", $timestamp);
        $dayofweek = date("w", $timestamp);
        
        $date = str_replace('%Y', $year, $format);
        $date = str_replace('%e', $day, $date);
        $date = str_replace('%B', $monthsofyear_lang[$month], $date);
        $date = str_replace('%b', $monthsofyearshort_lang[$month], $date);
        $date = str_replace('%A', $daysofweek_lang[$dayofweek], $date);
        $date = str_replace('%a', $daysofweekshort_lang[$dayofweek], $date);
        
        return $date;   
        
}
// calcOffset takes an offset (ie, -0500) and returns it in the number of 
seconds
function calcOffset($offset_str) {
        $sign = substr($offset_str, 0, 1);
        $hours = substr($offset_str, 1, 2);
        $mins = substr($offset_str, 3, 2);
        $secs = ((int)$hours * 3600) + ((int)$mins * 60);
        if ($sign == '-') $secs = 0 - $secs;
        return $secs;
}

// calcTime calculates the unixtime of a new offset by comparing it to the 
current offset
// $have is the current offset (ie, '-0500')
// $want is the wanted offset (ie, '-0700')
// $time is the unixtime relative to $have
function calcTime($have, $want, $time) {
        if ($have == 'none' || $want == 'none') return $time;
        $have_secs = calcOffset($have);
        $want_secs = calcOffset($want);
        $diff = $want_secs - $have_secs;
        $time += $diff;
        return $time;
}

function chooseOffset($time) {
        global $timezone, $tz_array;
        if (!isset($timezone)) $timezone = '';
        switch ($timezone) {
                case '':
                        $offset = 'none';
                        break;
                case 'Same as Server':
                        $offset = date('O', $time);
                        break;
                default:
                        if (is_array($tz_array) && array_key_exists($timezone, 
$tz_array)) {
                                $dlst = date('I', $time);
                                $offset = $tz_array[$timezone][$dlst];
                        } else {
                                $offset = '+0000';
                        }
        }
        return $offset;
}

function openevent($calendar_name, $start, $end, $arr, $lines, $wrap, 
$pre_text, $post_text, $link_class, $url) { 
        $event_text = stripslashes(urldecode($arr["event_text"]));
        # for iCal pseudo tag <http> comptability
        if (ereg("<([[:alpha:]]+://)([^<>[:space:]]+)>",$event_text,$matches)) 
{ 
                $full_event_text = $matches[1] . $matches[2]; 
                $event_text = $matches[2];
        } else { 
                $full_event_text = $event_text;
                $event_text = strip_tags($event_text, '<b><i><u>');
        }

        if (isset($arr["organizer"])) $organizer = 
addslashes($arr["organizer"]);
        if (isset($arr["attendee"])) $attendee = addslashes($arr["attendee"]);
        if (isset($arr["location"])) $location = addslashes($arr["location"]);
        if (isset($arr["status"])) $status = addslashes($arr["status"]);
        if (isset($arr["description"])) $description = 
addslashes(stripslashes(urldecode($arr["description"])));
    if (isset($arr["url"])) $url = 
addslashes(stripslashes(urldecode($arr["url"])));

        if (!empty($event_text)) {      
                if ($lines > 0) {
                        $event_text = word_wrap($event_text, $wrap, $lines);
                }

                if ((!(ereg("([[:alpha:]]+://[^<>[:space:]]+)", 
$full_event_text, $res))) || ($description)) {
                        $escaped_event = addslashes($full_event_text);
                        $escaped_calendar = addslashes($calendar_name);
                        $escaped_start = addslashes($start);
                        $escaped_end = addslashes($end);
                        // fix for URL-length bug in IE: populate and submit a 
hidden form on click
                        static $popup_data_index = 0;
echo <<<END

    <script language="Javascript" type="text/javascript"><!--
    var eventData = new EventData('$escaped_event', '$escaped_calendar', 
'$escaped_start', '$escaped_end', '$description', '$status', '$location', 
'$organizer', '$attendee', '$url');
    document.popup_data[$popup_data_index] = eventData;
    // --></script>

END;
                        echo '<a class="'.$link_class.'" href="#" 
onclick="openEventWindow('.$popup_data_index.'); return false;">';
                        $popup_data_index++;
                } else {
                        echo '<a class="'.$link_class.'" href="'.$res[1].'">';
                }
                echo $pre_text.$event_text.$post_text.'</a>'."\n";
        }
}


?>