The date_sunset() is an inbuilt function in PHP which is used to find the sunset time for a specified day and location.
Syntax:
date_sunset ( $timestamp, $format, $latitude, $longitude, $zenith, $gmtoffset )
Parameters: This function accepts four parameters as mentioned above and described below.
- $timestamp: It is a required parameter which specifies the timestamp of the day from which the sunset time is taken.
- $format: It is an optional parameter which specifies the format to return the result. Return format are given below:
- SUNFUNCS_RET_STRING: Returns a string. e.g. 16:46 (by default)
- SUNFUNCS_RET_DOUBLE: Returns a float. e.g. 16.12345
- SUNFUNCS_RET_TIMESTAMP: Returns the result as integer (timestamp). e.g. 987123569
- $latitude: It is an optional parameter which specifies the latitude of the location. By default, it set as North. To specify a value for South, pass in a negative value.
- $longitude: It is an optional parameter which specifies the longitude of the location. By default, it set as East. To modify a value for West, pass in a negative value.
- $zenith: It is an Optional parameter. The zenith is the angle between the center of the sun and a line perpendicular to earth’s surface, by default it is date.sunset_zenith.
- $gmtoffset: It is optional parameter and used to specifies the difference between GMT and local time in hours.
Return Value: It returns the time of the sunset, in the specified format, on success. FALSE on failure.
Exceptions: This function generates E_NOTICE error if date/time function is invalid and E_STRICT or E_WARNING if using the system setting or the TZ environment variable.
Below programs illustrate the date_sunset() function in PHP.
Program 1:
<?php // PHP program to show sunset time // of New delhi india for current day   // Longitude and latitude of Delhi India // 28.6139° N, 77.2090° E // GMT(Greenwich Mean Time) +5.30 // Zenith ~= 90   echo date("D M d Y"); echo("\nSunset time: "); echo(date_sunset(time(), SUNFUNCS_RET_STRING,                  28.6139, 77.2090, 90, 5.30)); ?> |
Output:
Wed Jun 27 2018 Sunset time: 19:07
Program 2:
<?php // PHP program to show sunset time // of GFG Noida for a Current day   // Longitude and latitude of neveropen // Noida 28°30'04.0"N 77°24'36.0"E // GMT(Greenwich Mean Time) +5.30 // Zenith ~= 90   echo date("D M d Y"); echo("\nSunset time: "); echo(date_sunset(time(), SUNFUNCS_RET_STRING,               28.501120, 77.409989, 90, 5.30)); ?> |
Output:
Wed Jun 27 2018 Sunset time: 19:06
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Reference: http://php.net/manual/en/function.date-sunset.php
