date_sunset
(PHP 5)
date_sunset --
Returns time of sunset for a given day and location
Description
mixed
date_sunset ( int timestamp [, int format [, float latitude [, float longitude [, float zenith [, float gmt_offset]]]]] )
date_sunset() returns the sunset time for a given
day (specified as a timestamp) and location.
Parameters
timestamp
The timestamp of the day from which the sunset
time is taken.
format
Table 1. format constants
| constant | 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
Default: date.sunrise_zenith
gmtoffset
Specified in hours.
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 message
if using the system settings or the TZ environment
variable. See also date_default_timezone_set()
Return Values
Returns the sunset time in a specified format on
success, or FALSE on failure.
Examples
Example 1. date_sunset() example
<?php
/* calculate the sunset time for Lisbon, Portugal
Latitude: 38.4 North
Longitude: 9 West
Zenith ~= 90
offset: +1 GMT
*/
echo date("D M d Y"). ', sunset time : ' .date_sunset(time(), SUNFUNCS_RET_STRING, 38.4, -9, 90, 1);
?>
|
The above example will output
something similar to: Mon Dec 20 2004, sunset time : 18:13 |
|