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Re: Check for military time

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From Thomas 'PointedEars' Lahn <PointedEars@web.de>
Newsgroups comp.lang.php
Subject Re: Check for military time
Date Thu, 22 Oct 2015 15:11:42 +0200
Organization PointedEars Software (PES)
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Stephan Elinghaus wrote:

> Am 2015-10-20 hat Derek Turner geschrieben:
>> Is there a quick and dirty way to check that
>>
>> substr($string, 0 ,3) is a valid military time, ie. 0000-2359?
> 
> Maybe this works for you:
> <?php
> $string="1534";
> if(preg_match("/[012](((?<=2)[0123])|(?<!2)[0-9])[[0-5][0-9]/",$string))

Much too complicated, and still not completely safe (you have not anchored 
the expression, neither on beginning or end of string or line, whitespace 
nor non-digits).  Consider instead:

  if (preg_match('/^(?:[01]\\d|2[0-3])[0-5]\\d$/', $string))

Test code:

$ php -r 'foreach (range(-1, 24) as $h) foreach (range(-1, 60) as $m) { echo 
preg_match("/^(?:[01]\\d|2[0-3])[0-5]\\d$/", sprintf("%02d", $h) . 
sprintf("%02d", $m)); if ($m === 60) echo "\n"; }'

You should get a box of zeros filled only with ones (because '0' is the 
string representation of “false”, and '1' of “true”).  The zeros are (quite 
literally) the edge cases that must not match, the ones the proper time 
strings.

> echo "is valid";
> else echo "is not valid";

With all such constructs, consider instead:

  echo ($boolean) ? $ifTrue : $ifFalse;

This is particularly useful if you can use “<?= … ?>” to just output the 
(string representation of) the result of an expression.

> ?>

Avoid ending PHP files with that; you may be accidentally outputting 
trailing whitespace otherwise.

-- 
PointedEars
Zend Certified PHP Engineer
Twitter: @PointedEars2
Please do not cc me. / Bitte keine Kopien per E-Mail.

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Thread

Check for military time Derek Turner <frderek@suremail.je> - 2015-10-20 18:57 +0000
  Re: Check for military time Derek Turner <frderek@suremail.je> - 2015-10-20 19:00 +0000
    Re: Check for military time Richard Yates <richard@yatesguitar.com> - 2015-10-20 21:35 -0700
      Re: Check for military time Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2015-10-21 16:12 -0400
        Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-10-21 22:38 -0400
          Re: Check for military time Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2015-10-22 10:43 -0400
            Re: Check for military time Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2015-10-22 10:48 -0400
            Re: Check for military time Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-10-22 17:20 +0200
            Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-10-22 12:19 -0400
            Re: Check for military time "Peter H. Coffin" <hellsop@ninehells.com> - 2015-10-22 15:32 -0500
              Re: Check for military time Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-10-22 23:08 +0200
                Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-10-22 20:19 -0400
                Re: Check for military time Matthew Carter <m@ahungry.com> - 2015-10-22 22:07 -0400
                Re: Check for military time "Beauregard T. Shagnasty" <a.nony.mous@example.invalid> - 2015-10-23 02:26 +0000
              Re: Check for military time Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2015-10-22 17:13 -0400
                Re: Check for military time Tim Streater <timstreater@greenbee.net> - 2015-10-22 22:57 +0100
                Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-10-22 20:22 -0400
                Re: Check for military time Tim Streater <timstreater@greenbee.net> - 2015-10-23 09:19 +0100
                Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-10-23 09:32 -0400
                Re: Check for military time Tim Streater <timstreater@greenbee.net> - 2015-10-23 15:43 +0100
                Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-10-23 11:11 -0400
                Re: Check for military time gordonb.nwjln@burditt.org (Gordon Burditt) - 2015-10-23 12:36 -0500
                Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-10-23 13:40 -0400
                Re: Check for military time Tim Streater <timstreater@greenbee.net> - 2015-10-23 18:54 +0100
                Re: Check for military time Norman Peelman <npeelman@cfl.rr.com> - 2015-10-23 22:44 -0400
                Re: Check for military time Tim Streater <timstreater@greenbee.net> - 2015-10-24 10:32 +0100
                Re: Check for military time Derek Turner <frderek@suremail.je> - 2015-10-24 11:41 +0000
                Re: Check for military time Norman Peelman <npeelman@cfl.rr.com> - 2015-10-24 15:15 -0400
                Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-10-22 20:21 -0400
                Re: Check for military time Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2015-10-22 20:38 -0400
                Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-10-22 20:47 -0400
              Re: Check for military time gordonb.90ylr@burditt.org (Gordon Burditt) - 2015-10-22 18:21 -0500
                Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-10-22 20:23 -0400
            Re: Check for military time gordonb.c5zx1@burditt.org (Gordon Burditt) - 2015-10-22 17:40 -0500
        Re: Check for military time Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-10-22 11:12 +0200
          Re: Check for military time Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2015-10-22 11:06 -0400
            Re: Check for military time Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-10-22 17:18 +0200
        Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-10-22 13:17 -0400
  Re: Check for military time Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-10-21 13:55 +0200
    Re: Check for military time "M. Strobel" <strobel@example.com> - 2015-10-21 20:56 +0200
      Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-10-21 16:48 -0400
  Re: Check for military time Stephan Elinghaus <221015.6.seli@spamgourmet.com> - 2015-10-22 13:16 +0200
    Re: Check for military time Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-10-22 15:11 +0200
      Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-10-22 10:23 -0400
        Re: Check for military time Arno Welzel <usenet@arnowelzel.de> - 2015-10-27 14:10 +0100
          Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-10-27 09:25 -0400
            Re: Check for military time Jørn Andersen <jorn@jorna.dk> - 2015-10-27 15:19 +0100
              Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-10-27 10:41 -0400
                Re: Check for military time Matthew Carter <m@ahungry.com> - 2015-10-27 23:03 -0400
                Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-10-27 23:29 -0400
                Re: Check for military time Erwin Moller <erwinmollerusenet@xs4all.nl> - 2015-10-29 10:08 +0100
                Re: Check for military time Matthew Carter <m@ahungry.com> - 2015-10-29 21:44 -0400
                Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-10-29 22:35 -0400
                Re: Check for military time Arno Welzel <usenet@arnowelzel.de> - 2015-10-30 20:08 +0100
                Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-10-30 16:22 -0400
                Re: Check for military time Arno Welzel <usenet@arnowelzel.de> - 2015-11-01 11:58 +0100
                Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-11-01 08:27 -0500
                Re: Check for military time Arno Welzel <usenet@arnowelzel.de> - 2015-11-01 14:36 +0100
                Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-11-01 09:05 -0500
                Re: Check for military time Arno Welzel <usenet@arnowelzel.de> - 2015-11-01 16:51 +0100
                Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-11-01 11:09 -0500
                Re: Check for military time Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-10-30 22:33 +0100
                Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-10-30 20:01 -0400
                Re: Check for military time Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-11-03 19:51 +0100
                Re: Check for military time Erwin Moller <erwinmollerusenet@xs4all.nl> - 2015-11-02 13:51 +0100
                Re: Check for military time Arno Welzel <usenet@arnowelzel.de> - 2015-11-02 18:57 +0100
                Re: Check for military time Erwin Moller <erwinmollerusenet@xs4all.nl> - 2015-11-04 15:18 +0100
                Re: Check for military time Matthew Carter <m@ahungry.com> - 2015-11-04 21:18 -0500
                Re: Check for military time Arno Welzel <usenet@arnowelzel.de> - 2015-11-05 07:51 +0100
                Re: Check for military time Arno Welzel <usenet@arnowelzel.de> - 2015-10-30 20:04 +0100
                Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-10-30 16:24 -0400
                Re: Check for military time Arno Welzel <usenet@arnowelzel.de> - 2015-11-01 12:06 +0100
                Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-11-01 08:30 -0500
                Re: Check for military time Arno Welzel <usenet@arnowelzel.de> - 2015-11-01 14:39 +0100
                Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-11-01 09:07 -0500
                Re: Check for military time Arno Welzel <usenet@arnowelzel.de> - 2015-11-01 16:58 +0100
                Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-11-01 11:05 -0500
                Re: Check for military time Arno Welzel <usenet@arnowelzel.de> - 2015-11-02 08:14 +0100
                Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-11-02 10:01 -0500
                Re: Check for military time Arno Welzel <usenet@arnowelzel.de> - 2015-11-02 17:54 +0100
                Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-11-02 12:50 -0500
                Re: Check for military time Arno Welzel <usenet@arnowelzel.de> - 2015-11-02 19:05 +0100
                Re: Check for military time Tim Streater <timstreater@greenbee.net> - 2015-11-02 18:23 +0000
                Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-11-02 15:23 -0500
                Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-11-02 15:16 -0500
                Re: Check for military time Arno Welzel <usenet@arnowelzel.de> - 2015-11-03 05:47 +0100
                Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-11-03 08:47 -0500
                Re: Check for military time Arno Welzel <usenet@arnowelzel.de> - 2015-11-04 03:55 +0100
                Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-11-03 22:09 -0500
                Re: Check for military time Arno Welzel <usenet@arnowelzel.de> - 2015-11-04 08:49 +0100
                Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-11-04 08:29 -0500
                Re: Check for military time Paul Herber <paul@pherber.com> - 2015-11-04 14:14 +0000
                Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-11-04 10:00 -0500
                Re: Check for military time Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-11-06 13:11 +0100
                Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-11-06 09:45 -0500
                Re: Check for military time Matthew Carter <m@ahungry.com> - 2015-11-07 21:50 -0500
                Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-11-07 22:05 -0500
                Re: Check for military time gordonb.2zzss@burditt.org (Gordon Burditt) - 2015-11-08 20:50 -0600
                Re: Check for military time Arno Welzel <usenet@arnowelzel.de> - 2015-11-09 10:29 +0100
                Re: Check for military time gordonb.00syf@burditt.org (Gordon Burditt) - 2015-11-10 23:42 -0600
                Re: Check for military time Arno Welzel <usenet@arnowelzel.de> - 2015-11-11 07:46 +0100
                Re: Check for military time Arno Welzel <usenet@arnowelzel.de> - 2015-11-11 07:50 +0100
                Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-11-11 08:06 -0500
                Re: Check for military time Arno Welzel <usenet@arnowelzel.de> - 2015-11-11 15:15 +0100
                Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-11-11 09:21 -0500
                Re: Check for military time Arno Welzel <usenet@arnowelzel.de> - 2015-11-11 17:46 +0100
                Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-11-11 15:12 -0500
                Re: Check for military time Arno Welzel <usenet@arnowelzel.de> - 2015-11-11 22:23 +0100
                Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-11-11 17:17 -0500
                Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-11-11 08:05 -0500
                OT: Munging addresses (was: Re: Check for military time) Arno Welzel <usenet@arnowelzel.de> - 2015-11-11 19:18 +0100
                Re: OT: Munging addresses Jerry Stuckle <jstucklex@attglobal.net> - 2015-11-11 15:16 -0500
                Re: OT: Munging addresses Arno Welzel <usenet@arnowelzel.de> - 2015-11-11 22:29 +0100
                Re: OT: Munging addresses Jerry Stuckle <jstucklex@attglobal.net> - 2015-11-11 17:20 -0500
                Re: OT: Munging addresses Arno Welzel <usenet@arnowelzel.de> - 2015-11-12 07:47 +0100
                Re: OT: Munging addresses Jerry Stuckle <jstucklex@attglobal.net> - 2015-11-12 10:15 -0500
                Re: OT: Munging addresses Arno Welzel <usenet@arnowelzel.de> - 2015-11-12 17:17 +0100
                Re: OT: Munging addresses Jerry Stuckle <jstucklex@attglobal.net> - 2015-11-12 11:59 -0500
                Re: OT: Munging addresses Arno Welzel <usenet@arnowelzel.de> - 2015-11-12 18:51 +0100
                Re: OT: Munging addresses Jerry Stuckle <jstucklex@attglobal.net> - 2015-11-12 14:20 -0500
                Re: OT: Munging addresses Arno Welzel <usenet@arnowelzel.de> - 2015-11-12 20:59 +0100
                Re: OT: Munging addresses Jerry Stuckle <jstucklex@attglobal.net> - 2015-11-12 16:54 -0500
                Re: OT: Munging addresses Jim Higgins <ILikeMy@Privacy.invalid> - 2015-11-18 16:24 +0000
              PHP code section end marker (was: Check for military time) Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-10-27 22:58 +0100
            Re: Check for military time Arno Welzel <usenet@arnowelzel.de> - 2015-10-30 20:01 +0100
              Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-10-30 16:27 -0400
                Re: Check for military time Arno Welzel <usenet@arnowelzel.de> - 2015-11-01 12:12 +0100
                Re: Check for military time Jerry Stuckle <jstucklex@attglobal.net> - 2015-11-01 08:31 -0500

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