PHP embedding functions inside strings?

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LEARN ABOUT PHP

easter_date

EASTER_DATE(3)								 1							    EASTER_DATE(3)

easter_date - Get Unix timestamp for midnight on Easter of a given year

SYNOPSIS

       int easter_date ([int  $year = date("Y")])

DESCRIPTION

	Returns the Unix timestamp corresponding to midnight on Easter of the given year.

       Warning

	       This function will generate a warning if the year is outside of the range for Unix timestamps (i.e. before 1970 or after 2037).

	The  date  of Easter Day was defined by the Council of Nicaea in AD325 as the Sunday after the first full moon which falls on or after the
       Spring Equinox. The Equinox is assumed to always fall on 21st March, so the calculation reduces to determining the date of  the	full  moon
       and  the  date  of  the following Sunday. The algorithm used here was introduced around the year 532 by Dionysius Exiguus. Under the Julian
       Calendar (for years before 1753) a simple 19-year cycle is used to track the phases of the Moon. Under the Gregorian  Calendar  (for  years
       after  1753 - devised by Clavius and Lilius, and introduced by Pope Gregory XIII in October 1582, and into Britain and its then colonies in
       September 1752) two correction factors are added to make the cycle more accurate.

PARAMETERS

	      o $year
		- The year as a number between 1970 an 2037. If omitted, defaults to the current year according to the local time.

RETURN VALUES

	The easter date as a unix timestamp.

EXAMPLES

       Example #1

	      easter_date(3) example

	      <?php

	      echo date("M-d-Y", easter_date(1999));	    // Apr-04-1999
	      echo date("M-d-Y", easter_date(2000));	    // Apr-23-2000
	      echo date("M-d-Y", easter_date(2001));	    // Apr-15-2001

	      ?>

NOTES

       Note

	      easter_date(3) relies on your system's C library time functions, rather than using PHP's internal date and time functions. As a con-
	      sequence,  easter_date(3)  uses the TZ environment variable to determine the time zone it should operate in, rather than using PHP's
	      default time zone, which may result in unexpected behaviour when using this function in conjunction with	other  date  functions	in
	      PHP.

	       As  a  workaround,  you can use the easter_days(3) with DateTime and DateInterval to calculate the start of Easter in your PHP time
	      zone as follows:

	      <?php
	      function get_easter_datetime($year) {
		  $base = new DateTime("$year-03-21");
		  $days = easter_days($year);

		  return $base->add(new DateInterval("P{$days}D"));
	      }

	      foreach (range(2012, 2015) as $year) {
		  printf("Easter in %d is on %s
",
			 $year,
			 get_easter_datetime($year)->format('F j'));
	      }
	      ?>

	      The above example will output:

	      Easter in 2012 is on April 8
	      Easter in 2013 is on March 31
	      Easter in 2014 is on April 20
	      Easter in 2015 is on April 5

SEE ALSO

       easter_days(3) for calculating Easter before 1970 or after 2037 .

PHP Documentation Group 													    EASTER_DATE(3)

Shell Programming and Scripting