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1.1 misho 1: /*
2: +----------------------------------------------------------------------+
3: | PHP Version 5 |
4: +----------------------------------------------------------------------+
5: | Copyright (c) 1997-2012 The PHP Group |
6: +----------------------------------------------------------------------+
7: | This source file is subject to version 3.01 of the PHP license, |
8: | that is bundled with this package in the file LICENSE, and is |
9: | available through the world-wide-web at the following url: |
10: | http://www.php.net/license/3_01.txt |
11: | If you did not receive a copy of the PHP license and are unable to |
12: | obtain it through the world-wide-web, please send a note to |
13: | license@php.net so we can mail you a copy immediately. |
14: +----------------------------------------------------------------------+
15: | Authors: Shane Caraveo <shane@caraveo.com> |
16: | Colin Viebrock <colin@easydns.com> |
17: | Hartmut Holzgraefe <hholzgra@php.net> |
18: +----------------------------------------------------------------------+
19: */
20: /* $Id: */
21:
22: #include "php.h"
23: #include "php_calendar.h"
24: #include "sdncal.h"
25: #include <time.h>
26:
27: static void _cal_easter(INTERNAL_FUNCTION_PARAMETERS, int gm)
28: {
29:
30: /* based on code by Simon Kershaw, <webmaster@ely.anglican.org> */
31:
32: struct tm te;
33: long year, golden, solar, lunar, pfm, dom, tmp, easter;
34: long method = CAL_EASTER_DEFAULT;
35:
36: /* Default to the current year if year parameter is not given */
37: {
38: time_t a;
39: struct tm b, *res;
40: time(&a);
41: res = php_localtime_r(&a, &b);
42: if (!res) {
43: year = 1900;
44: } else {
45: year = 1900 + b.tm_year;
46: }
47: }
48:
49: if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC,
50: "|ll", &year, &method) == FAILURE) {
51: return;
52: }
53:
54: if (gm && (year<1970 || year>2037)) { /* out of range for timestamps */
55: php_error_docref(NULL TSRMLS_CC, E_WARNING, "This function is only valid for years between 1970 and 2037 inclusive");
56: RETURN_FALSE;
57: }
58:
59: golden = (year % 19) + 1; /* the Golden number */
60:
61: if ((year <= 1582 && method != CAL_EASTER_ALWAYS_GREGORIAN) ||
62: (year >= 1583 && year <= 1752 && method != CAL_EASTER_ROMAN && method != CAL_EASTER_ALWAYS_GREGORIAN) ||
63: method == CAL_EASTER_ALWAYS_JULIAN) { /* JULIAN CALENDAR */
64:
65: dom = (year + (year/4) + 5) % 7; /* the "Dominical number" - finding a Sunday */
66: if (dom < 0) {
67: dom += 7;
68: }
69:
70: pfm = (3 - (11*golden) - 7) % 30; /* uncorrected date of the Paschal full moon */
71: if (pfm < 0) {
72: pfm += 30;
73: }
74: } else { /* GREGORIAN CALENDAR */
75: dom = (year + (year/4) - (year/100) + (year/400)) % 7; /* the "Domincal number" */
76: if (dom < 0) {
77: dom += 7;
78: }
79:
80: solar = (year-1600)/100 - (year-1600)/400; /* the solar and lunar corrections */
81: lunar = (((year-1400) / 100) * 8) / 25;
82:
83: pfm = (3 - (11*golden) + solar - lunar) % 30; /* uncorrected date of the Paschal full moon */
84: if (pfm < 0) {
85: pfm += 30;
86: }
87: }
88:
89: if ((pfm == 29) || (pfm == 28 && golden > 11)) { /* corrected date of the Paschal full moon */
90: pfm--; /* - days after 21st March */
91: }
92:
93: tmp = (4-pfm-dom) % 7;
94: if (tmp < 0) {
95: tmp += 7;
96: }
97:
98: easter = pfm + tmp + 1; /* Easter as the number of days after 21st March */
99:
100: if (gm) { /* return a timestamp */
101: te.tm_isdst = -1;
102: te.tm_year = year-1900;
103: te.tm_sec = 0;
104: te.tm_min = 0;
105: te.tm_hour = 0;
106:
107: if (easter < 11) {
108: te.tm_mon = 2; /* March */
109: te.tm_mday = easter+21;
110: } else {
111: te.tm_mon = 3; /* April */
112: te.tm_mday = easter-10;
113: }
114:
115: Z_LVAL_P(return_value) = mktime(&te);
116: } else { /* return the days after March 21 */
117: Z_LVAL_P(return_value) = easter;
118: }
119:
120: Z_TYPE_P(return_value) = IS_LONG;
121:
122: }
123:
124: /* {{{ proto int easter_date([int year])
125: Return the timestamp of midnight on Easter of a given year (defaults to current year) */
126: PHP_FUNCTION(easter_date)
127: {
128: _cal_easter(INTERNAL_FUNCTION_PARAM_PASSTHRU, 1);
129: }
130: /* }}} */
131:
132: /* {{{ proto int easter_days([int year, [int method]])
133: Return the number of days after March 21 that Easter falls on for a given year (defaults to current year) */
134: PHP_FUNCTION(easter_days)
135: {
136: _cal_easter(INTERNAL_FUNCTION_PARAM_PASSTHRU, 0);
137: }
138: /* }}} */
139:
140: /*
141: * Local variables:
142: * tab-width: 4
143: * c-basic-offset: 4
144: * End:
145: */