iCal解析器顯示事件數量

Question

我已經徹底研究過，找不到解決方案。我是PHP新手，通過語言學習儘可能多地學習。我將不勝感激任何幫助！

我正在使用iCal解析器並試圖限制它，因此它一次只返回15個事件。我怎樣才能做到這一點？

<?php 
    /* iCal Parser - Some PHP functions to parse an iCal calendar into a usable PHP object. 
    *    Also convert the object into pretty HTML. 
    * 
    * Copyright (C) 2006 Adam Wolfe Gordon 
    * 
    * This program is free software; you can redistribute it and/or 
    * modify it under the terms of the GNU General Public License 
    * as published by the Free Software Foundation; either version 2 
    * of the License, or (at your option) any later version. 
    * 
    * This program is distributed in the hope that it will be useful, 
    * but WITHOUT ANY WARRANTY; without even the implied warranty of 
    * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 
    * GNU General Public License for more details. 
    * 
    * You should have received a copy of the GNU General Public License 
    * along with this program; if not, write to the Free Software 
    * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. 
    */ 

    // Blatantly stolen from http://ca3.php.net/manual/en/function.xml-parse-into-struct.php 
    // Convert xml into a nice object 
    class XmlElement { 
     var $name; 
     var $attributes; 
     var $content; 
     var $children; 
    }; 

    function xml_to_object($xml) { 
    $parser = xml_parser_create(); 
    xml_parser_set_option($parser, XML_OPTION_CASE_FOLDING, 0); 
    xml_parser_set_option($parser, XML_OPTION_SKIP_WHITE, 1); 
    xml_parse_into_struct($parser, $xml, $tags); 
    xml_parser_free($parser); 

    $elements = array(); // the currently filling [child] XmlElement array 
    $stack = array(); 
     foreach ($tags as $tag) { 
     $index = count($elements); 
     if ($tag['type'] == "complete" || $tag['type'] == "open") { 
      $elements[$index] = new XmlElement; 
      $elements[$index]->name = $tag['tag']; 
      $elements[$index]->attributes = $tag['attributes']; 
      $elements[$index]->content = $tag['value']; 
      if ($tag['type'] == "open") { // push 
     $elements[$index]->children = array(); 
     $stack[count($stack)] = &$elements; 
     $elements = &$elements[$index]->children; 
      } 
     } 
     if ($tag['type'] == "close") { // pop 
     $elements = &$stack[count($stack) - 1]; 
     unset($stack[count($stack) - 1]); 
     } 
     } 
     return $elements[0]; // the single top-level element 
    } 

    // Not stolen 
    // Fetch text from an iCal URL and convert it into xml $myfile = file_get_contents($URL); 
    function ical2xml($URL) { 
     $myfile = file_get_contents($URL); 
     $myfile = str_replace("\n ", "", $myfile); 
     $myfile = str_replace("&", " and ", $myfile); 
     $mylines = split("\n", $myfile); 

     $xml = "";  
     foreach($mylines as $line) { 
     if($line == "") 
      continue; 

    list($key,$val) = split(":", $line); 
    $key = trim($key, "\r\n"); 
    $val = trim($val, "\r\n"); 
    $val = str_replace("\n", "", $val); 
    $val = str_replace("\r", "", $val); 

    $attribs = split(";", $key); 
    $key = $attribs[0]; 
    $attribs = array_slice($attribs, 1); 

    $myattribs = " "; 
    foreach($attribs as $attrib) { 
     list($att, $attval) = split("=", $attrib); 
     $myattribs .= "$att=\"$attval\" "; 
    } 
    $myattribs = rtrim($myattribs); 

    // BEGIN and END keywords 
    if($key == 'BEGIN') { 
     $xml .= "<$val$myattribs>\n"; 
    } else if($key == 'END') { 
     $xml .= "</$val>\n"; 
    } else { 
     $xml .= "<$key$myattribs>$val</$key>\n"; 
    } 
    } 

     return $xml; 
    } 

    // Event class 
    class event { 
     var $starttime; 
     var $endtime; 
     var $allday; 
     var $rrulefreq; 
     var $rruledays; 
     var $rruleuntil; 
     var $description; 
     var $location; 
     var $summary; 
    }; 

    // Calendar class 
    class calendar { 
     var $name; 
     var $timezone; 
     var $description; 
     var $events = array(); 
    }; 

    // Timezone class 
    class timezone { 
     var $namestd; 
     var $namedst; 
     var $offsetstd; 
     var $offsetdst; 
    }; 

    // Convert a time in iCal's ugly format to a unix timestamp 
    function ical_time_to_timestamp($time) { 
     $hour = substr($time, 9, 2); 
     if($hour == "") 
     $hour = 0; 
     $min = substr($time, 11, 2); 
     if($min == "") 
     $min = 0; 
     $sec = substr($time, 13, 2); 
     if($sec == "") 
     $sec = 0; 
     $mon = substr($time, 4, 2); 
     $day = substr($time, 6, 2); 
     $year = substr($time, 0, 4); 
     return mktime($hour, $min, $sec, $mon, $day, $year); 
    } 

    // The day the world ends (for Unix users) 
    $endoftime = ical_time_to_timestamp("20380118T000000"); 

    // Event comparison function for sorting 
    function cmp($a, $b) { 
     if(!(is_object($a) && is_object($b))) 
    return 0; 
    if($a->starttime == $b->starttime) 
    return 0; 
    return ($a->starttime < $b->starttime) ? -1 : 1; 
} 

// Convert XML into a calendar object 
function xml_to_calendar($xml) { 
    $mycal = new calendar; 
    $eventcount = 0; 

    $thecal = xml_to_object($xml); 

    foreach($thecal->children as $child) { 
    switch($child->name) { 
    case "X-WR-CALNAME": 
     $mycal->name = $child->content; 
     break; 
    case "X-WR-CALDESC": 
     $mycal->description = $child->content; 
     break; 
    case "VTIMEZONE": 
     $mycal->timezone = new timezone; 
     foreach($child->children as $data) { 
    switch($data->name) { 
    case "STANDARD": 
     foreach($data->children as $sec) { 
     switch($sec->name) { 
     case "TZNAME": 
      $mycal->timezone->namestd = $sec->content; 
      break; 
     case "TZOFFSETTO": 
      $mycal->timezone->offsetstd = $sec->content; 
      break; 
     default: 
      break; 
     } 
     } 
     break; 
    case "DAYLIGHT": 
     foreach($data->children as $sec) { 
     switch($sec->name) { 
     case "TZNAME": 
      $mycal->timezone->namedst = $sec->content; 
      break; 
     case "TZOFFSETTO": 
      $mycal->timezone->offsetdst = $sec->content; 
      break; 
     default: 
      break; 
     } 
     } 
     break; 
    default: 
     break; 
    } 
     } 
     break; 
    case "VEVENT": 
     $i = $eventcount; 
     $mycal->events[$i] = new event; 
     $mycal->events[$i]->allday = FALSE; 
     $eventcount++; 
     foreach($child->children as $data) { 
    switch($data->name) { 
    case "DTSTART": 
     if(substr($data->content, 9, 6) == "") { 
     $mycal->events[$i]->allday = TRUE; 
     $mycal->events[$i]->starttime = ical_time_to_timestamp($data->content . "T000000"); 
     } else 
     $mycal->events[$i]->starttime = ical_time_to_timestamp($data->content); 
     break; 
    case "DTEND": 
     if(substr($data->content, 9, 6) == "") { 
     $mycal->events[$i]->allday = TRUE; 
     $mycal->events[$i]->endtime = ical_time_to_timestamp($data->content . "T000000"); 
     } else 
     $mycal->events[$i]->endtime = ical_time_to_timestamp($data->content); 
     break; 
    case "DURATION": 
     $mycal->events[$i]->endtime = $mycal->events[$i]->starttime + substr($data->content, 2, strlen($data->content) - 1); 
     break; 
    case "RRULE": 
     $myrrule = split(";", $data->content); 
     // Unless otherwise specified, repeating events go until the end of time 
     $mycal->events[$i]->rruleuntil = $endoftime; 
     foreach($myrrule as $part) { 
     list($a, $b) = split("=", $part); 
     switch($a) { 
     case "FREQ": 
      $mycal->events[$i]->rrulefreq = $b; 
      break; 
     case "BYDAY": 
      $mycal->events[$i]->rruledays = $b; 
      break; 
     case "UNTIL": 
      $mycal->events[$i]->rruleuntil = ical_time_to_timestamp($b); 
      break; 
     default: 
      break; 
     } 
     } 
     break; 
    case "DESCRIPTION": 
     $mycal->events[$i]->description = $data->content; 
     break; 
    case "LOCATION": 
     $mycal->events[$i]->location = $data->content; 
     break; 
    case "SUMMARY": 
     $mycal->events[$i]->summary = $data->content; 
     break; 
    default: 
     break; 
    } 
     } 
     break; 
    default: 
     break; 
    } 
    } 

    // Sort events by start date/time 
    usort($mycal->events, "cmp"); 

    return $mycal; 
} 

// Take in an iCal object and spit out pretty HTML. 
function objToHTML($thecal) { 
    // Days of the week 
    $shortdays = array( "MO"=>"Mon", 
      "TU"=>"Tue", 
      "WE"=>"Wed", 
      "TH"=>"Thu", 
      "FR"=>"Fri", 
      "SA"=>"Sat", 
      "SU"=>"Sun" 
      ); 

    // Global variables from the config file 
    global $timeformat; 
    global $dateformat; 
    global $noyearformat; 
    global $nodayformat; 
    global $xthday; 

    $nc = "<table>"; 
foreach($thecal->events as $event) { 

if($event->starttime > time() || ($event->rrulefreq && (time() < $event->rruleuntil || $event->rruleuntil == $endoftime))) { 

     if($event->rrulefreq == "WEEKLY") { 
    $days = str_replace(",", ", ", $event->rruledays); 
    $repdays = split(",", $event->rruledays); 
    foreach($repdays as $repday) { 
     $days = str_replace($repday, $shortdays[$repday], $days); 
    } 

    $prefix = "Every week on $shortdays"; 

    if($event->starttime > time()) { 
     if($event->allday == FALSE) { 
     $fromto = " starting " . date($dateformat, $event->starttime) . " from " . date($timeformat, $event->starttime) . " to " . date($timeformat, $event->endtime); 
     } else { 
     $fromto = " all day starting " . date($dateformat, $event->starttime); 
     } 
    } else { 
     if($event->allday == FALSE) { 
     $fromto = " from " . date($timeformat, $event->starttime) . " to " . date($timeformat, $event->endtime); 
     } else { 
     $fromto = ", all day"; 
     } 
    } 

    if($event->rruleuntil != $endoftime) { 
     $until = " until " . date($dateformat, $event->rruleuntil); 
    } else { 
     $until = ""; 
    } 
     } else if($event->rrulefreq == "MONTHLY") { 
    $prefix = "The " . date($xthday, $event->starttime) . " day of each month"; 

    if($event->starttime > time()) { 
     if($event->allday == FALSE) { 
     $fromto = " starting " . date($nodayformat, $event->starttime) . " from " . date($timeformat, $event->starttime) . " to " . date($timeformat, $event->endtime); 
     } else { 
     $fromto = " starting " . date($nodayformat, $event->starttime); 
     } 
    } else { 
     if($event->allday == FALSE) { 
     $fromto = " from " . date($timeformat, $event->starttime) . " to " . date($timeformat, $event->endtime); 
     } else { 
     $fromto = ", all day"; 
     } 
    } 

    if($event->rruleuntil != $endoftime) { 
     $until = " until " . date($nodayformat, $event->rruleuntil); 
    } else { 
     $until = ""; 
    } 
     } else if($event->rrulefreq == "DAILY") { 
    $prefix = "Every day"; 

    if($event->starttime > time()) { 
     if($event->allday == FALSE) { 
     $fromto = " starting " . date($dateformat, $event->starttime) . " from " . date($timeformat, $event->starttime) . " to " . date($timeformat, $event->endtime); 
     } else { 
     $fromto = " all day starting " . date($dateformat, $event->starttime); 
     } 
    } else { 
     if($event->allday == FALSE) { 
     $fromto = " from " . date($timeformat, $event->starttime) . " to " . date($timeformat, $event->endtime); 
     } else { 
     $fromto = " all day"; 
     } 
    } 


    if($event->rruleuntil != $endoftime) { 
     $until = " until " . date($dateformat, $event->rruleuntil); 
    } else { 
     $until = ""; 
    } 
     } else if($event->rrulefreq == "YEARLY") { 
    $prefix = date($noyearformat, $event->starttime); 

    if($event->allday == FALSE) { 
     $fromto = " from " . date($timeformat, $event->starttime) . " to " . date($timeformat, $event->endtime); 
    } else { 
     $fromto = ", all day"; 
    } 

    if($event->rruleuntil != $endoftime) { 
     $until = " until " . date("Y", $event->rruleuntil); 
    } else { 
     $until = ""; 
    } 
     } else { 
    $prefix = date($dateformat, $event->starttime); 

    $until = ""; 
     } 


     $nc .= "<tr><td><font size='1' face='Verdana'>" . $prefix . $fromto . $until . "</font></td>\n"; 


     $nc .= "<td><font size='1' face='Verdana'>" . $event->summary . "</font></td></tr>\n"; 
    } 
    } 
    $nc .= "</table>"; 

    return $nc; 
} 
function endElement($parser, $event) { 
global $prefix, $event, $fromto, $until, $description; 
static $counter = 0; 
if ($event == "ITEM" && !(++$counter > 15)) { 
} 
} 
?> 

Answer 1

你的意思是15個事件（什麼用BEGIN開始：VEVENT與END結束：VEVENT中的iCalendar文件），或者你的意思是（每個實例被定義爲一個日期事件的15個實例，在該VEVENT發生按是個續訂規則（或只是DTSTART/DTEND的情況下，沒有RRULE存在）。

的情況下，你只需要15個事件，您只需要修改功能objToHTML($thecal)，只是if($event->starttime > time() || ($event->rrulefreq && (time() < $event->rruleuntil || $event->rruleuntil == $endoftime))) {後計數，直到你達到15

如果您想要15個實例，您需要編寫一個枚舉器來替換$prefix . $fromto . $until字符串與實際實例的計算日期，然後對它們進行計數直到您達到15爲止。