我已经彻底研究过，我找不到解决方案。我是 PHP 新手，并且通过该语言尽可能多地学习。我将不胜感激任何帮助！
我正在使用 iCal 解析器并试图限制它，因此它一次只返回 15 个事件。我怎样才能做到这一点？
<?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)) {
}
}
?>