← All changes | feedtime.class.php +44 -13 2010.0528 → trunk View file →

		@@ -1,18 +1,39 @@
1	1	<?php
2	2	/**
3	3	* class FeedTime: handle common date-time formats used in feeds.
	4	+ * We will try to be as tolerant as possible of different representations, since
	5	+ * RSS Is A Fucking Mess, broken dates seem to be especially pervasive, etc.
	6	+ * Supports anything that your version of PHP's strtotime() can handle; also has
	7	+ * a built-in parser for W3C DTF, in case your PHP doesn't have that.
4	8	*
	9	+ * Tries to parse a W3C DTF first; then falls back to strtotime(). If strtotime
	10	+ * fails due to a mystery timezone, then we will try again on local time, with
	11	+ * the timezone stripped out.
	12	+ *
	13	+ * To parse a string representation of a date-time from a feed, instantiate and
	14	+ * then pull the timestamp:
	15	+ *
	16	+ * $time = new FeedTime($s);
	17	+ * if ( ! $time->failed()) :
	18	+ * $ts = $time->timestamp();
	19	+ * else :
	20	+ * // ...
	21	+ * endif;
5	22	*/
6	23	class FeedTime {
7	24	var $rep;
8	25	var $ts;
9	26
10		- function FeedTime ($time) {
	27	+ function __construct( $time ) {
11	28	$this->set($time);
12	29	} /* FeedTime constructor */
13	30
14		- function set ($time) {
	31	+ function FeedTime( $time ) {
	32	+ self::__construct( $time );
	33	+ }
	34	+
	35	+ function set ($time, $recurse = false) {
15	36	$this->rep = $time;
16	37	$this->ts = NULL;
17	38	if (is_numeric($time)) : // Presumably a Unix-epoch timestamp
18	39	$this->ts = $this->rep;
		@@ -20,12 +41,12 @@
20	41	// First, try to parse it as a W3C date-time
21	42	$this->ts = $this->parse_w3cdtf();
22	43
23	44	if ($this->failed()) :
24		- // In some versions of PHP, strtotime() does not support
25		- // the UT timezone. Since UT is by definition within 1
26		- // second of UTC, we'll just convert it here to avoid
27		- // problems.
	45	+ // In some versions of PHP, strtotime() does not
	46	+ // support the UT timezone. But since UT is by
	47	+ // definition within 1 second of UTC, we'll just
	48	+ // convert it preemptively to avoid problems.
28	49	$time = preg_replace(
29	50	'/(\s)UT$/',
30	51	'$1UTC',
31	52	$time
		@@ -30,8 +51,14 @@
30	51	'$1UTC',
31	52	$time
32	53	);
33	54	$this->ts = strtotime($time);
	55	+
	56	+ if ($this->failed()
	57	+ and preg_match('/^(.*)([+\-][0-9]+|\s+[A-Za-z]{1,3})$/', $time, $matches)) :
	58	+ // Try dropping the time zone and recurse
	59	+ $this->set($matches[1], /*recurse=*/ true);
	60	+ endif;
34	61	endif;
35	62	endif;
36	63	} /* FeedTime::set() */
37	64
		@@ -36,9 +63,9 @@
36	63	} /* FeedTime::set() */
37	64
38	65	function timestamp () {
39	66	$unix = NULL;
40		- if (!$this->failed()) :
	67	+ if ( ! $this->failed()) :
41	68	$unix = $this->ts;
42	69	endif;
43	70	return $unix;
44	71	} /* FeedTime::timestamp() */
		@@ -43,9 +70,9 @@
43	70	return $unix;
44	71	} /* FeedTime::timestamp() */
45	72
46	73	function failed () {
47		- return (!is_numeric($this->ts) or !$this->ts or ($this->ts <= 0));
	74	+ return ( !is_numeric($this->ts) or ! $this->ts or ($this->ts <= 0));
48	75	} /* FeedTime::failed() */
49	76
50	77	/**
51	78	* FeedTime::parse_w3cdtf() parses a W3C date-time format date into a
		@@ -102,15 +129,19 @@
102	129	$offset = 0;
103	130	if ( isset($match[15]) and $match[15] == 'Z' ) :
104	131	# zulu time, aka GMT
105	132	else :
106		- $tz_mod = $match[12];
107		- $tz_hour = $match[13];
108		- $tz_min = $match[14];
	133	+ $tz_mod = (isset($match[12]) ? $match[12] : NULL);
	134	+ $tz_hour = (isset($match[13]) ? $match[13] : NULL);
	135	+ $tz_min = (isset($match[14]) ? $match[14] : NULL);
109	136
110	137	# zero out the variables
111		- if ( ! $tz_hour ) { $tz_hour = 0; }
112		- if ( ! $tz_min ) { $tz_min = 0; }
	138	+ if ( is_null($tz_hour) ) :
	139	+ $offset = (int) get_option('gmt_offset');
	140	+ $tz_hour = abs($offset);
	141	+ $tz_mod = ((abs($offset) != $offset) ? '-' : '+');
	142	+ endif;
	143	+ if ( is_null($tz_min) ) : $tz_min = 0; endif;
113	144
114	145	$offset_secs = (($tz_hour*60)+$tz_min)*60;
115	146
116	147	# is timezone ahead of GMT? then subtract offset