1: <?php
  2: /**
  3:  * SimplePie
  4:  *
  5:  * A PHP-Based RSS and Atom Feed Framework.
  6:  * Takes the hard work out of managing a complete RSS/Atom solution.
  7:  *
  8:  * Copyright (c) 2004-2012, Ryan Parman, Geoffrey Sneddon, Ryan McCue, and contributors
  9:  * All rights reserved.
 10:  *
 11:  * Redistribution and use in source and binary forms, with or without modification, are
 12:  * permitted provided that the following conditions are met:
 13:  *
 14:  *  * Redistributions of source code must retain the above copyright notice, this list of
 15:  *    conditions and the following disclaimer.
 16:  *
 17:  *  * Redistributions in binary form must reproduce the above copyright notice, this list
 18:  *    of conditions and the following disclaimer in the documentation and/or other materials
 19:  *    provided with the distribution.
 20:  *
 21:  *  * Neither the name of the SimplePie Team nor the names of its contributors may be used
 22:  *    to endorse or promote products derived from this software without specific prior
 23:  *    written permission.
 24:  *
 25:  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
 26:  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 27:  * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS
 28:  * AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 29:  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 30:  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 31:  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 32:  * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 33:  * POSSIBILITY OF SUCH DAMAGE.
 34:  *
 35:  * @package SimplePie
 36:  * @version 1.3
 37:  * @copyright 2004-2012 Ryan Parman, Geoffrey Sneddon, Ryan McCue
 38:  * @author Ryan Parman
 39:  * @author Geoffrey Sneddon
 40:  * @author Ryan McCue
 41:  * @link http://simplepie.org/ SimplePie
 42:  * @license http://www.opensource.org/licenses/bsd-license.php BSD License
 43:  */
 44: 
 45: 
 46: /**
 47:  * Date Parser
 48:  *
 49:  * @package SimplePie
 50:  * @subpackage Parsing
 51:  */
 52: class SimplePie_Parse_Date
 53: {
 54:     /**
 55:      * Input data
 56:      *
 57:      * @access protected
 58:      * @var string
 59:      */
 60:     var $date;
 61: 
 62:     /**
 63:      * List of days, calendar day name => ordinal day number in the week
 64:      *
 65:      * @access protected
 66:      * @var array
 67:      */
 68:     var $day = array(
 69:         // English
 70:         'mon' => 1,
 71:         'monday' => 1,
 72:         'tue' => 2,
 73:         'tuesday' => 2,
 74:         'wed' => 3,
 75:         'wednesday' => 3,
 76:         'thu' => 4,
 77:         'thursday' => 4,
 78:         'fri' => 5,
 79:         'friday' => 5,
 80:         'sat' => 6,
 81:         'saturday' => 6,
 82:         'sun' => 7,
 83:         'sunday' => 7,
 84:         // Dutch
 85:         'maandag' => 1,
 86:         'dinsdag' => 2,
 87:         'woensdag' => 3,
 88:         'donderdag' => 4,
 89:         'vrijdag' => 5,
 90:         'zaterdag' => 6,
 91:         'zondag' => 7,
 92:         // French
 93:         'lundi' => 1,
 94:         'mardi' => 2,
 95:         'mercredi' => 3,
 96:         'jeudi' => 4,
 97:         'vendredi' => 5,
 98:         'samedi' => 6,
 99:         'dimanche' => 7,
100:         // German
101:         'montag' => 1,
102:         'dienstag' => 2,
103:         'mittwoch' => 3,
104:         'donnerstag' => 4,
105:         'freitag' => 5,
106:         'samstag' => 6,
107:         'sonnabend' => 6,
108:         'sonntag' => 7,
109:         // Italian
110:         'lunedì' => 1,
111:         'martedì' => 2,
112:         'mercoledì' => 3,
113:         'giovedì' => 4,
114:         'venerdì' => 5,
115:         'sabato' => 6,
116:         'domenica' => 7,
117:         // Spanish
118:         'lunes' => 1,
119:         'martes' => 2,
120:         'miércoles' => 3,
121:         'jueves' => 4,
122:         'viernes' => 5,
123:         'sábado' => 6,
124:         'domingo' => 7,
125:         // Finnish
126:         'maanantai' => 1,
127:         'tiistai' => 2,
128:         'keskiviikko' => 3,
129:         'torstai' => 4,
130:         'perjantai' => 5,
131:         'lauantai' => 6,
132:         'sunnuntai' => 7,
133:         // Hungarian
134:         'hétfő' => 1,
135:         'kedd' => 2,
136:         'szerda' => 3,
137:         'csütörtok' => 4,
138:         'péntek' => 5,
139:         'szombat' => 6,
140:         'vasárnap' => 7,
141:         // Greek
142:         'Δευ' => 1,
143:         'Τρι' => 2,
144:         'Τετ' => 3,
145:         'Πεμ' => 4,
146:         'Παρ' => 5,
147:         'Σαβ' => 6,
148:         'Κυρ' => 7,
149:     );
150: 
151:     /**
152:      * List of months, calendar month name => calendar month number
153:      *
154:      * @access protected
155:      * @var array
156:      */
157:     var $month = array(
158:         // English
159:         'jan' => 1,
160:         'january' => 1,
161:         'feb' => 2,
162:         'february' => 2,
163:         'mar' => 3,
164:         'march' => 3,
165:         'apr' => 4,
166:         'april' => 4,
167:         'may' => 5,
168:         // No long form of May
169:         'jun' => 6,
170:         'june' => 6,
171:         'jul' => 7,
172:         'july' => 7,
173:         'aug' => 8,
174:         'august' => 8,
175:         'sep' => 9,
176:         'september' => 8,
177:         'oct' => 10,
178:         'october' => 10,
179:         'nov' => 11,
180:         'november' => 11,
181:         'dec' => 12,
182:         'december' => 12,
183:         // Dutch
184:         'januari' => 1,
185:         'februari' => 2,
186:         'maart' => 3,
187:         'april' => 4,
188:         'mei' => 5,
189:         'juni' => 6,
190:         'juli' => 7,
191:         'augustus' => 8,
192:         'september' => 9,
193:         'oktober' => 10,
194:         'november' => 11,
195:         'december' => 12,
196:         // French
197:         'janvier' => 1,
198:         'février' => 2,
199:         'mars' => 3,
200:         'avril' => 4,
201:         'mai' => 5,
202:         'juin' => 6,
203:         'juillet' => 7,
204:         'août' => 8,
205:         'septembre' => 9,
206:         'octobre' => 10,
207:         'novembre' => 11,
208:         'décembre' => 12,
209:         // German
210:         'januar' => 1,
211:         'februar' => 2,
212:         'märz' => 3,
213:         'april' => 4,
214:         'mai' => 5,
215:         'juni' => 6,
216:         'juli' => 7,
217:         'august' => 8,
218:         'september' => 9,
219:         'oktober' => 10,
220:         'november' => 11,
221:         'dezember' => 12,
222:         // Italian
223:         'gennaio' => 1,
224:         'febbraio' => 2,
225:         'marzo' => 3,
226:         'aprile' => 4,
227:         'maggio' => 5,
228:         'giugno' => 6,
229:         'luglio' => 7,
230:         'agosto' => 8,
231:         'settembre' => 9,
232:         'ottobre' => 10,
233:         'novembre' => 11,
234:         'dicembre' => 12,
235:         // Spanish
236:         'enero' => 1,
237:         'febrero' => 2,
238:         'marzo' => 3,
239:         'abril' => 4,
240:         'mayo' => 5,
241:         'junio' => 6,
242:         'julio' => 7,
243:         'agosto' => 8,
244:         'septiembre' => 9,
245:         'setiembre' => 9,
246:         'octubre' => 10,
247:         'noviembre' => 11,
248:         'diciembre' => 12,
249:         // Finnish
250:         'tammikuu' => 1,
251:         'helmikuu' => 2,
252:         'maaliskuu' => 3,
253:         'huhtikuu' => 4,
254:         'toukokuu' => 5,
255:         'kesäkuu' => 6,
256:         'heinäkuu' => 7,
257:         'elokuu' => 8,
258:         'suuskuu' => 9,
259:         'lokakuu' => 10,
260:         'marras' => 11,
261:         'joulukuu' => 12,
262:         // Hungarian
263:         'január' => 1,
264:         'február' => 2,
265:         'március' => 3,
266:         'április' => 4,
267:         'május' => 5,
268:         'június' => 6,
269:         'július' => 7,
270:         'augusztus' => 8,
271:         'szeptember' => 9,
272:         'október' => 10,
273:         'november' => 11,
274:         'december' => 12,
275:         // Greek
276:         'Ιαν' => 1,
277:         'Φεβ' => 2,
278:         'Μάώ' => 3,
279:         'Μαώ' => 3,
280:         'Απρ' => 4,
281:         'Μάι' => 5,
282:         'Μαϊ' => 5,
283:         'Μαι' => 5,
284:         'Ιούν' => 6,
285:         'Ιον' => 6,
286:         'Ιούλ' => 7,
287:         'Ιολ' => 7,
288:         'Αύγ' => 8,
289:         'Αυγ' => 8,
290:         'Σεπ' => 9,
291:         'Οκτ' => 10,
292:         'Νοέ' => 11,
293:         'Δεκ' => 12,
294:     );
295: 
296:     /**
297:      * List of timezones, abbreviation => offset from UTC
298:      *
299:      * @access protected
300:      * @var array
301:      */
302:     var $timezone = array(
303:         'ACDT' => 37800,
304:         'ACIT' => 28800,
305:         'ACST' => 34200,
306:         'ACT' => -18000,
307:         'ACWDT' => 35100,
308:         'ACWST' => 31500,
309:         'AEDT' => 39600,
310:         'AEST' => 36000,
311:         'AFT' => 16200,
312:         'AKDT' => -28800,
313:         'AKST' => -32400,
314:         'AMDT' => 18000,
315:         'AMT' => -14400,
316:         'ANAST' => 46800,
317:         'ANAT' => 43200,
318:         'ART' => -10800,
319:         'AZOST' => -3600,
320:         'AZST' => 18000,
321:         'AZT' => 14400,
322:         'BIOT' => 21600,
323:         'BIT' => -43200,
324:         'BOT' => -14400,
325:         'BRST' => -7200,
326:         'BRT' => -10800,
327:         'BST' => 3600,
328:         'BTT' => 21600,
329:         'CAST' => 18000,
330:         'CAT' => 7200,
331:         'CCT' => 23400,
332:         'CDT' => -18000,
333:         'CEDT' => 7200,
334:         'CET' => 3600,
335:         'CGST' => -7200,
336:         'CGT' => -10800,
337:         'CHADT' => 49500,
338:         'CHAST' => 45900,
339:         'CIST' => -28800,
340:         'CKT' => -36000,
341:         'CLDT' => -10800,
342:         'CLST' => -14400,
343:         'COT' => -18000,
344:         'CST' => -21600,
345:         'CVT' => -3600,
346:         'CXT' => 25200,
347:         'DAVT' => 25200,
348:         'DTAT' => 36000,
349:         'EADT' => -18000,
350:         'EAST' => -21600,
351:         'EAT' => 10800,
352:         'ECT' => -18000,
353:         'EDT' => -14400,
354:         'EEST' => 10800,
355:         'EET' => 7200,
356:         'EGT' => -3600,
357:         'EKST' => 21600,
358:         'EST' => -18000,
359:         'FJT' => 43200,
360:         'FKDT' => -10800,
361:         'FKST' => -14400,
362:         'FNT' => -7200,
363:         'GALT' => -21600,
364:         'GEDT' => 14400,
365:         'GEST' => 10800,
366:         'GFT' => -10800,
367:         'GILT' => 43200,
368:         'GIT' => -32400,
369:         'GST' => 14400,
370:         'GST' => -7200,
371:         'GYT' => -14400,
372:         'HAA' => -10800,
373:         'HAC' => -18000,
374:         'HADT' => -32400,
375:         'HAE' => -14400,
376:         'HAP' => -25200,
377:         'HAR' => -21600,
378:         'HAST' => -36000,
379:         'HAT' => -9000,
380:         'HAY' => -28800,
381:         'HKST' => 28800,
382:         'HMT' => 18000,
383:         'HNA' => -14400,
384:         'HNC' => -21600,
385:         'HNE' => -18000,
386:         'HNP' => -28800,
387:         'HNR' => -25200,
388:         'HNT' => -12600,
389:         'HNY' => -32400,
390:         'IRDT' => 16200,
391:         'IRKST' => 32400,
392:         'IRKT' => 28800,
393:         'IRST' => 12600,
394:         'JFDT' => -10800,
395:         'JFST' => -14400,
396:         'JST' => 32400,
397:         'KGST' => 21600,
398:         'KGT' => 18000,
399:         'KOST' => 39600,
400:         'KOVST' => 28800,
401:         'KOVT' => 25200,
402:         'KRAST' => 28800,
403:         'KRAT' => 25200,
404:         'KST' => 32400,
405:         'LHDT' => 39600,
406:         'LHST' => 37800,
407:         'LINT' => 50400,
408:         'LKT' => 21600,
409:         'MAGST' => 43200,
410:         'MAGT' => 39600,
411:         'MAWT' => 21600,
412:         'MDT' => -21600,
413:         'MESZ' => 7200,
414:         'MEZ' => 3600,
415:         'MHT' => 43200,
416:         'MIT' => -34200,
417:         'MNST' => 32400,
418:         'MSDT' => 14400,
419:         'MSST' => 10800,
420:         'MST' => -25200,
421:         'MUT' => 14400,
422:         'MVT' => 18000,
423:         'MYT' => 28800,
424:         'NCT' => 39600,
425:         'NDT' => -9000,
426:         'NFT' => 41400,
427:         'NMIT' => 36000,
428:         'NOVST' => 25200,
429:         'NOVT' => 21600,
430:         'NPT' => 20700,
431:         'NRT' => 43200,
432:         'NST' => -12600,
433:         'NUT' => -39600,
434:         'NZDT' => 46800,
435:         'NZST' => 43200,
436:         'OMSST' => 25200,
437:         'OMST' => 21600,
438:         'PDT' => -25200,
439:         'PET' => -18000,
440:         'PETST' => 46800,
441:         'PETT' => 43200,
442:         'PGT' => 36000,
443:         'PHOT' => 46800,
444:         'PHT' => 28800,
445:         'PKT' => 18000,
446:         'PMDT' => -7200,
447:         'PMST' => -10800,
448:         'PONT' => 39600,
449:         'PST' => -28800,
450:         'PWT' => 32400,
451:         'PYST' => -10800,
452:         'PYT' => -14400,
453:         'RET' => 14400,
454:         'ROTT' => -10800,
455:         'SAMST' => 18000,
456:         'SAMT' => 14400,
457:         'SAST' => 7200,
458:         'SBT' => 39600,
459:         'SCDT' => 46800,
460:         'SCST' => 43200,
461:         'SCT' => 14400,
462:         'SEST' => 3600,
463:         'SGT' => 28800,
464:         'SIT' => 28800,
465:         'SRT' => -10800,
466:         'SST' => -39600,
467:         'SYST' => 10800,
468:         'SYT' => 7200,
469:         'TFT' => 18000,
470:         'THAT' => -36000,
471:         'TJT' => 18000,
472:         'TKT' => -36000,
473:         'TMT' => 18000,
474:         'TOT' => 46800,
475:         'TPT' => 32400,
476:         'TRUT' => 36000,
477:         'TVT' => 43200,
478:         'TWT' => 28800,
479:         'UYST' => -7200,
480:         'UYT' => -10800,
481:         'UZT' => 18000,
482:         'VET' => -14400,
483:         'VLAST' => 39600,
484:         'VLAT' => 36000,
485:         'VOST' => 21600,
486:         'VUT' => 39600,
487:         'WAST' => 7200,
488:         'WAT' => 3600,
489:         'WDT' => 32400,
490:         'WEST' => 3600,
491:         'WFT' => 43200,
492:         'WIB' => 25200,
493:         'WIT' => 32400,
494:         'WITA' => 28800,
495:         'WKST' => 18000,
496:         'WST' => 28800,
497:         'YAKST' => 36000,
498:         'YAKT' => 32400,
499:         'YAPT' => 36000,
500:         'YEKST' => 21600,
501:         'YEKT' => 18000,
502:     );
503: 
504:     /**
505:      * Cached PCRE for SimplePie_Parse_Date::$day
506:      *
507:      * @access protected
508:      * @var string
509:      */
510:     var $day_pcre;
511: 
512:     /**
513:      * Cached PCRE for SimplePie_Parse_Date::$month
514:      *
515:      * @access protected
516:      * @var string
517:      */
518:     var $month_pcre;
519: 
520:     /**
521:      * Array of user-added callback methods
522:      *
523:      * @access private
524:      * @var array
525:      */
526:     var $built_in = array();
527: 
528:     /**
529:      * Array of user-added callback methods
530:      *
531:      * @access private
532:      * @var array
533:      */
534:     var $user = array();
535: 
536:     /**
537:      * Create new SimplePie_Parse_Date object, and set self::day_pcre,
538:      * self::month_pcre, and self::built_in
539:      *
540:      * @access private
541:      */
542:     public function __construct()
543:     {
544:         $this->day_pcre = '(' . implode(array_keys($this->day), '|') . ')';
545:         $this->month_pcre = '(' . implode(array_keys($this->month), '|') . ')';
546: 
547:         static $cache;
548:         if (!isset($cache[get_class($this)]))
549:         {
550:             $all_methods = get_class_methods($this);
551: 
552:             foreach ($all_methods as $method)
553:             {
554:                 if (strtolower(substr($method, 0, 5)) === 'date_')
555:                 {
556:                     $cache[get_class($this)][] = $method;
557:                 }
558:             }
559:         }
560: 
561:         foreach ($cache[get_class($this)] as $method)
562:         {
563:             $this->built_in[] = $method;
564:         }
565:     }
566: 
567:     /**
568:      * Get the object
569:      *
570:      * @access public
571:      */
572:     public static function get()
573:     {
574:         static $object;
575:         if (!$object)
576:         {
577:             $object = new SimplePie_Parse_Date;
578:         }
579:         return $object;
580:     }
581: 
582:     /**
583:      * Parse a date
584:      *
585:      * @final
586:      * @access public
587:      * @param string $date Date to parse
588:      * @return int Timestamp corresponding to date string, or false on failure
589:      */
590:     public function parse($date)
591:     {
592:         foreach ($this->user as $method)
593:         {
594:             if (($returned = call_user_func($method, $date)) !== false)
595:             {
596:                 return $returned;
597:             }
598:         }
599: 
600:         foreach ($this->built_in as $method)
601:         {
602:             if (($returned = call_user_func(array($this, $method), $date)) !== false)
603:             {
604:                 return $returned;
605:             }
606:         }
607: 
608:         return false;
609:     }
610: 
611:     /**
612:      * Add a callback method to parse a date
613:      *
614:      * @final
615:      * @access public
616:      * @param callback $callback
617:      */
618:     public function add_callback($callback)
619:     {
620:         if (is_callable($callback))
621:         {
622:             $this->user[] = $callback;
623:         }
624:         else
625:         {
626:             trigger_error('User-supplied function must be a valid callback', E_USER_WARNING);
627:         }
628:     }
629: 
630:     /**
631:      * Parse a superset of W3C-DTF (allows hyphens and colons to be omitted, as
632:      * well as allowing any of upper or lower case "T", horizontal tabs, or
633:      * spaces to be used as the time seperator (including more than one))
634:      *
635:      * @access protected
636:      * @return int Timestamp
637:      */
638:     public function date_w3cdtf($date)
639:     {
640:         static $pcre;
641:         if (!$pcre)
642:         {
643:             $year = '([0-9]{4})';
644:             $month = $day = $hour = $minute = $second = '([0-9]{2})';
645:             $decimal = '([0-9]*)';
646:             $zone = '(?:(Z)|([+\-])([0-9]{1,2}):?([0-9]{1,2}))';
647:             $pcre = '/^' . $year . '(?:-?' . $month . '(?:-?' . $day . '(?:[Tt\x09\x20]+' . $hour . '(?::?' . $minute . '(?::?' . $second . '(?:.' . $decimal . ')?)?)?' . $zone . ')?)?)?$/';
648:         }
649:         if (preg_match($pcre, $date, $match))
650:         {
651:             /*
652:             Capturing subpatterns:
653:             1: Year
654:             2: Month
655:             3: Day
656:             4: Hour
657:             5: Minute
658:             6: Second
659:             7: Decimal fraction of a second
660:             8: Zulu
661:             9: Timezone ±
662:             10: Timezone hours
663:             11: Timezone minutes
664:             */
665: 
666:             // Fill in empty matches
667:             for ($i = count($match); $i <= 3; $i++)
668:             {
669:                 $match[$i] = '1';
670:             }
671: 
672:             for ($i = count($match); $i <= 7; $i++)
673:             {
674:                 $match[$i] = '0';
675:             }
676: 
677:             // Numeric timezone
678:             if (isset($match[9]) && $match[9] !== '')
679:             {
680:                 $timezone = $match[10] * 3600;
681:                 $timezone += $match[11] * 60;
682:                 if ($match[9] === '-')
683:                 {
684:                     $timezone = 0 - $timezone;
685:                 }
686:             }
687:             else
688:             {
689:                 $timezone = 0;
690:             }
691: 
692:             // Convert the number of seconds to an integer, taking decimals into account
693:             $second = round($match[6] + $match[7] / pow(10, strlen($match[7])));
694: 
695:             return gmmktime($match[4], $match[5], $second, $match[2], $match[3], $match[1]) - $timezone;
696:         }
697:         else
698:         {
699:             return false;
700:         }
701:     }
702: 
703:     /**
704:      * Remove RFC822 comments
705:      *
706:      * @access protected
707:      * @param string $data Data to strip comments from
708:      * @return string Comment stripped string
709:      */
710:     public function remove_rfc2822_comments($string)
711:     {
712:         $string = (string) $string;
713:         $position = 0;
714:         $length = strlen($string);
715:         $depth = 0;
716: 
717:         $output = '';
718: 
719:         while ($position < $length && ($pos = strpos($string, '(', $position)) !== false)
720:         {
721:             $output .= substr($string, $position, $pos - $position);
722:             $position = $pos + 1;
723:             if ($string[$pos - 1] !== '\\')
724:             {
725:                 $depth++;
726:                 while ($depth && $position < $length)
727:                 {
728:                     $position += strcspn($string, '()', $position);
729:                     if ($string[$position - 1] === '\\')
730:                     {
731:                         $position++;
732:                         continue;
733:                     }
734:                     elseif (isset($string[$position]))
735:                     {
736:                         switch ($string[$position])
737:                         {
738:                             case '(':
739:                                 $depth++;
740:                                 break;
741: 
742:                             case ')':
743:                                 $depth--;
744:                                 break;
745:                         }
746:                         $position++;
747:                     }
748:                     else
749:                     {
750:                         break;
751:                     }
752:                 }
753:             }
754:             else
755:             {
756:                 $output .= '(';
757:             }
758:         }
759:         $output .= substr($string, $position);
760: 
761:         return $output;
762:     }
763: 
764:     /**
765:      * Parse RFC2822's date format
766:      *
767:      * @access protected
768:      * @return int Timestamp
769:      */
770:     public function date_rfc2822($date)
771:     {
772:         static $pcre;
773:         if (!$pcre)
774:         {
775:             $wsp = '[\x09\x20]';
776:             $fws = '(?:' . $wsp . '+|' . $wsp . '*(?:\x0D\x0A' . $wsp . '+)+)';
777:             $optional_fws = $fws . '?';
778:             $day_name = $this->day_pcre;
779:             $month = $this->month_pcre;
780:             $day = '([0-9]{1,2})';
781:             $hour = $minute = $second = '([0-9]{2})';
782:             $year = '([0-9]{2,4})';
783:             $num_zone = '([+\-])([0-9]{2})([0-9]{2})';
784:             $character_zone = '([A-Z]{1,5})';
785:             $zone = '(?:' . $num_zone . '|' . $character_zone . ')';
786:             $pcre = '/(?:' . $optional_fws . $day_name . $optional_fws . ',)?' . $optional_fws . $day . $fws . $month . $fws . $year . $fws . $hour . $optional_fws . ':' . $optional_fws . $minute . '(?:' . $optional_fws . ':' . $optional_fws . $second . ')?' . $fws . $zone . '/i';
787:         }
788:         if (preg_match($pcre, $this->remove_rfc2822_comments($date), $match))
789:         {
790:             /*
791:             Capturing subpatterns:
792:             1: Day name
793:             2: Day
794:             3: Month
795:             4: Year
796:             5: Hour
797:             6: Minute
798:             7: Second
799:             8: Timezone ±
800:             9: Timezone hours
801:             10: Timezone minutes
802:             11: Alphabetic timezone
803:             */
804: 
805:             // Find the month number
806:             $month = $this->month[strtolower($match[3])];
807: 
808:             // Numeric timezone
809:             if ($match[8] !== '')
810:             {
811:                 $timezone = $match[9] * 3600;
812:                 $timezone += $match[10] * 60;
813:                 if ($match[8] === '-')
814:                 {
815:                     $timezone = 0 - $timezone;
816:                 }
817:             }
818:             // Character timezone
819:             elseif (isset($this->timezone[strtoupper($match[11])]))
820:             {
821:                 $timezone = $this->timezone[strtoupper($match[11])];
822:             }
823:             // Assume everything else to be -0000
824:             else
825:             {
826:                 $timezone = 0;
827:             }
828: 
829:             // Deal with 2/3 digit years
830:             if ($match[4] < 50)
831:             {
832:                 $match[4] += 2000;
833:             }
834:             elseif ($match[4] < 1000)
835:             {
836:                 $match[4] += 1900;
837:             }
838: 
839:             // Second is optional, if it is empty set it to zero
840:             if ($match[7] !== '')
841:             {
842:                 $second = $match[7];
843:             }
844:             else
845:             {
846:                 $second = 0;
847:             }
848: 
849:             return gmmktime($match[5], $match[6], $second, $month, $match[2], $match[4]) - $timezone;
850:         }
851:         else
852:         {
853:             return false;
854:         }
855:     }
856: 
857:     /**
858:      * Parse RFC850's date format
859:      *
860:      * @access protected
861:      * @return int Timestamp
862:      */
863:     public function date_rfc850($date)
864:     {
865:         static $pcre;
866:         if (!$pcre)
867:         {
868:             $space = '[\x09\x20]+';
869:             $day_name = $this->day_pcre;
870:             $month = $this->month_pcre;
871:             $day = '([0-9]{1,2})';
872:             $year = $hour = $minute = $second = '([0-9]{2})';
873:             $zone = '([A-Z]{1,5})';
874:             $pcre = '/^' . $day_name . ',' . $space . $day . '-' . $month . '-' . $year . $space . $hour . ':' . $minute . ':' . $second . $space . $zone . '$/i';
875:         }
876:         if (preg_match($pcre, $date, $match))
877:         {
878:             /*
879:             Capturing subpatterns:
880:             1: Day name
881:             2: Day
882:             3: Month
883:             4: Year
884:             5: Hour
885:             6: Minute
886:             7: Second
887:             8: Timezone
888:             */
889: 
890:             // Month
891:             $month = $this->month[strtolower($match[3])];
892: 
893:             // Character timezone
894:             if (isset($this->timezone[strtoupper($match[8])]))
895:             {
896:                 $timezone = $this->timezone[strtoupper($match[8])];
897:             }
898:             // Assume everything else to be -0000
899:             else
900:             {
901:                 $timezone = 0;
902:             }
903: 
904:             // Deal with 2 digit year
905:             if ($match[4] < 50)
906:             {
907:                 $match[4] += 2000;
908:             }
909:             else
910:             {
911:                 $match[4] += 1900;
912:             }
913: 
914:             return gmmktime($match[5], $match[6], $match[7], $month, $match[2], $match[4]) - $timezone;
915:         }
916:         else
917:         {
918:             return false;
919:         }
920:     }
921: 
922:     /**
923:      * Parse C99's asctime()'s date format
924:      *
925:      * @access protected
926:      * @return int Timestamp
927:      */
928:     public function date_asctime($date)
929:     {
930:         static $pcre;
931:         if (!$pcre)
932:         {
933:             $space = '[\x09\x20]+';
934:             $wday_name = $this->day_pcre;
935:             $mon_name = $this->month_pcre;
936:             $day = '([0-9]{1,2})';
937:             $hour = $sec = $min = '([0-9]{2})';
938:             $year = '([0-9]{4})';
939:             $terminator = '\x0A?\x00?';
940:             $pcre = '/^' . $wday_name . $space . $mon_name . $space . $day . $space . $hour . ':' . $min . ':' . $sec . $space . $year . $terminator . '$/i';
941:         }
942:         if (preg_match($pcre, $date, $match))
943:         {
944:             /*
945:             Capturing subpatterns:
946:             1: Day name
947:             2: Month
948:             3: Day
949:             4: Hour
950:             5: Minute
951:             6: Second
952:             7: Year
953:             */
954: 
955:             $month = $this->month[strtolower($match[2])];
956:             return gmmktime($match[4], $match[5], $match[6], $month, $match[3], $match[7]);
957:         }
958:         else
959:         {
960:             return false;
961:         }
962:     }
963: 
964:     /**
965:      * Parse dates using strtotime()
966:      *
967:      * @access protected
968:      * @return int Timestamp
969:      */
970:     public function date_strtotime($date)
971:     {
972:         $strtotime = strtotime($date);
973:         if ($strtotime === -1 || $strtotime === false)
974:         {
975:             return false;
976:         }
977:         else
978:         {
979:             return $strtotime;
980:         }
981:     }
982: }
983: 
984: