note 51323 added to function.date-sunrise
| From: | php at stock-consulting dot com | Date: | Sun, 27 Mar 2005 12:22:39 +0000 |
| Subject: | note 51323 added to function.date-sunrise | ||
| Groups: | php.notes | ||
| Request: | Send a blank email to php-notes+get-87055@lists.php.net to get a copy of this message | ||
The function of jbr (AT) ya-right.com will run into an infinite loop for dates/locations without,
for example, astronomical twilight (it never gets dark enough for astronomical twilight during June
in Cologne, for exmple). Below a quick fix:
<?
function sun_times($time, $lat, $lon, $offset, $format, $dst) {
$offset += $dst;
$offset = $offset == 13 ? -11 : $offset;
$math = array(1.5708, 4.71239, 3.14159, 6.28319, (0.0174533 * $lat), (0.0174533 * $lon),
(0.261799 * $offset));
$data = array('astronomical' => -.309017, 'nautical' => -.207912,
'civil' => -.104528, 'sun' => -.0145439);
$sd = explode(' ', date('n j Y z', $time));
$times = array();
foreach ($data as $a => $b) {
for ($x = 0; $x <= 1; $x++) {
$e = $sd[3] + (($math[$x] - $math[5]) / $math[3]);
$f = ($e * .017202) - .0574039;
$g = $f + .0334405 * sin($f);
$g += 4.93289 + (3.49066E-04) * sin(2 * $f);
while ($g < 0) {
$g += $math[3];
}
while ($g >= $math[3]) {
$g -= $math[3];
}
$g += ($g / $math[0]) - intval($g / $math[0]) == 0 ? 4.84814E-06 : 0;
$h = sin($g) / cos($g);
$h = atan2(.91746 * $h, 1);
$h += $g > $math[1] ? $math[3] : ($g > $math[0] ? $math[2] : 0);
$i = .39782 * sin($g);
$i = $i / sqrt (-$i * $i + 1);
$i = atan2($i, 1);
$j = $b - (sin($i) * sin($math[4]));
$j = $j / (cos($i) * cos($math[4]));
$j = $j / sqrt(-$j * $j + 1);
$j = $math[0] - atan2($j, 1);
if (!$x) {
$j = $math[3] - $j;
}
$k = $j + $h - 0.0172028 * $e - 1.73364;
$l = $k - $math[5];
$n = $l + $math[6];
// Changes begin here
$key = ($a != 'sun' ? ($x ? 'end' : 'start') : ($x ? $a .
'set' : $a . 'rise'));
if (is_nan($n)) {
$times[$a][$key] = '-';
} else {
while ($n < 0) {
$n += $math[3];
}
while ($n >= $math[3]) {
$n -= $math[3];
}
$n = $n * 3.81972;
$hour = intval($n);
$mins = intval((($n - $hour) * 60) + 0.5);
$times[$a][$key] = date($format, mktime($hour, $mins, 0, $sd[0], $sd[1], $sd[2]));
}
// Changes end here
}
}
return($times);
}
?>
----
Manual Page -- http://www.php.net/manual/en/function.date-sunrise.php
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