date_sunrise
(PHP 5, PHP 7)
date_sunrise — Returns time of sunrise for a given day and location
Description
$timestamp
[, int $format = SUNFUNCS_RET_STRING
[, float $latitude = ini_get("date.default_latitude")
[, float $longitude = ini_get("date.default_longitude")
[, float $zenith = ini_get("date.sunrise_zenith")
[, float $gmt_offset = 0
]]]]] ) : mixed
date_sunrise() returns the sunrise time for a given
day (specified as a timestamp) and location.
Parameters
-
timestamp -
The
timestampof the day from which the sunrise time is taken. -
format -
formatconstantsconstant description example SUNFUNCS_RET_STRING returns the result as string 16:46 SUNFUNCS_RET_DOUBLE returns the result as float 16.78243132 SUNFUNCS_RET_TIMESTAMP returns the result as integer (timestamp) 1095034606 -
latitude -
Defaults to North, pass in a negative value for South. See also: date.default_latitude
-
longitude -
Defaults to East, pass in a negative value for West. See also: date.default_longitude
-
zenith -
zenithis the angle between the center of the sun and a line perpendicular to earth's surface. It defaults to date.sunrise_zenithCommon zenithanglesAngle Description 90°50' Sunrise: the point where the sun becomes visible. 96° Civil twilight: conventionally used to signify the start of dawn. 102° Nautical twilight: the point at which the horizon starts being visible at sea. 108° Astronomical twilight: the point at which the sun starts being the source of any illumination. -
gmtoffset -
Specified in hours. The
gmtoffsetis ignored, ifformatisSUNFUNCS_RET_TIMESTAMP.
Return Values
Returns the sunrise time in a specified format on
success or FALSE on failure. One potential reason for failure is that the
sun does not rise at all, which happens inside the polar circles for part of
the year.
Errors/Exceptions
Every call to a date/time function will generate a E_NOTICE
if the time zone is not valid, and/or a E_STRICT
or E_WARNING message
if using the system settings or the TZ environment
variable. See also date_default_timezone_set()
Examples
Example #1 date_sunrise() example
<?php
/* calculate the sunrise time for Lisbon, Portugal
Latitude: 38.4 North
Longitude: 9 West
Zenith ~= 90
offset: +1 GMT
*/
echo date("D M d Y"). ', sunrise time : ' .date_sunrise(time(), SUNFUNCS_RET_STRING, 38.4, -9, 90, 1);
?>
The above example will output something similar to:
Mon Dec 20 2004, sunrise time : 08:54
Example #2 No sunrise
<?php
$solstice = strtotime('2017-12-21');
var_dump(date_sunrise($solstice, SUNFUNCS_RET_STRING, 69.245833, -53.537222));
?>
The above example will output:
bool(false)
See Also
- date_sunset() - Returns time of sunset for a given day and location
- date_sun_info() - Returns an array with information about sunset/sunrise and twilight begin/end
English translation
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Document created the 30/01/2003, last modified the 26/10/2018
Source of the printed document:https://www.gaudry.be/en/php-rf-date-sunrise.html
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References
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