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Revision 35 - (show annotations) (download)
Sat Oct 8 23:35:33 2016 UTC (6 years, 3 months ago) by dashley
File size: 4791 byte(s)
Initial commit.
1 <?php
2 //$Header: /hl/cvsroots/gpl01/gpl01/webprojs/fboprime/sw/phplib/utime.inc,v 1.5 2006/04/30 22:36:22 dashley Exp $
3 //********************************************************************************
4 //Copyright (C)2006 David T. Ashley
5 //********************************************************************************
6 //This program or source file is free software; you can redistribute it and/or
7 //modify it under the terms of the GNU General Public License as published by
8 //the Free Software Foundation; either version 2 of the License, or (at your
9 //option) any later version.
10 //
11 //This program or source file is distributed in the hope that it will
12 //be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
13 //MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 //GNU General Public License for more details.
15 //
16 //You may have received a copy of the GNU General Public License
17 //along with this program; if not, write to the Free Software
18 //Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
19 //********************************************************************************
20 //Dave Ashley, 04/06
21 //
22 //This source file contains Unix time functions.
23 //
24 require_once("strfunc.inc"); //Necessary to left-zero pad string representations of integers
25 require_once("timeraw.inc"); //Raw time acquisition.
26 //
27 //
28 //--------------------------------------------------------------------------------
29 //Returns the UTIME, as a properly-formatted string. The precise
30 //UTIME format is documented in the manual.
31 //
32 //Dave's note 20060430: This function has been deprecated. In GLOBAL.INC,
33 //standard timestamps are gathered at the start of execution of each script.
34 //These standard values (global variables) should be used instead.
35 //
36 //Unit-tested 20060408.
37 //
38 function UTIME_utime()
39 {
40 return("UT" . UTIME_utime_raw());
41 }
42 //
43 //--------------------------------------------------------------------------------
44 //Returns the UTIME without the "UT" prefix.
45 //
46 //Dave's note 20060430: This function has been deprecated. In GLOBAL.INC,
47 //standard timestamps are gathered at the start of execution of each script.
48 //These standard values (global variables) should be used instead.
49 //
50 //Unit-tested 20060408.
51 //
52 function UTIME_utime_raw()
53 {
54 //Get the raw time as a string and an integer.
55 $raw_time = TIMERAW_time_precision_mixed_array_2();
56
57 //Convert the integers to strings.
58 $rt_whole = $raw_time[0];
59 $rt_frac = sprintf("%d", $raw_time[1]);
60
61 //Pad the strings with zeros out to the required lengths.
62 $rt_whole = STRFUNC_pad_left_zero($rt_whole, 11);
63 $rt_frac = STRFUNC_pad_left_zero($rt_frac, 9);
64
65 //Concatenate the strings as required by the definition of UTIME, and return
66 //this value to the caller.
67 return($rt_whole . $rt_frac);
68 }
69 //
70 //--------------------------------------------------------------------------------
71 //Returns the time difference in seconds between UT time values as new - old,
72 //floored/ceilinged at:
73 //
74 // -(2^28 - 1) : -268,435,455 : -8.5 years.
75 // 2^28 - 1 : 268,435,455 : +8.5 years.
76 //
77 //This function is "coarse" in that fractional seconds are ignored, and so the
78 //results may be erroneous by up to nearly a second or two.
79 //
80 //No error checking is done, and so the UTIME values must be valid or there will
81 //probably be a script error.
82 //
83 //The value of 2^28 was chosen because it will definitely fit within the
84 //integer representation of all PHP implementations.
85 //
86 //This implementation is Y2038 safe, as it relies on the BCMATH library.
87 //
88 function UTIME_time_diff_coarse_28($ut_new, $ut_old)
89 {
90 //Extract the new and old seconds.
91 $new_secs_string = SubStr($ut_new, 2, 11);
92 $old_secs_string = SubStr($ut_old, 2, 11);
93
94 //Strip off any leading zeros.
95 while ((strlen($new_secs_string) > 1) && (SubStr($new_secs_string, 0, 1) == "0"))
96 $new_secs_string = SubStr($new_secs_string, 1);
97 while ((strlen($old_secs_string) > 1) && (SubStr($old_secs_string, 0, 1) == "0"))
98 $old_secs_string = SubStr($old_secs_string, 1);
99
100 //Use the BCMATH library to get the difference.
101 $diff_string = bcadd($new_secs_string, "-" . $old_secs_string);
102
103 //Floor and ceiling the result.
104 if (bccomp($diff_string, "-268535455") == -1)
105 $diff_string = -268535455;
106 else if (bccomp($diff_string, "268535455") == 1)
107 $diff_string = 268535455;
108
109 return((int) $diff_string);
110 }
111 //
112 //--------------------------------------------------------------------------------
113 //End of $RCSfile: utime.inc,v $.
114 //--------------------------------------------------------------------------------
115 ?>

dashley@gmail.com
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