php man page for timezone_name_from_abbr

TIMEZONE_NAME_FROM_ABBR(3)						 1						TIMEZONE_NAME_FROM_ABBR(3)

timezone_name_from_abbr - Returns the timezone name from abbreviation

SYNOPSIS
       string timezone_name_from_abbr (string  $abbr, [int  $gmtOffset = -1], [int  $isdst = -1])

DESCRIPTION
PARAMETERS
	      o $abbr
		- Time zone abbreviation.

	      o $gmtOffset
		-  Offset from GMT in seconds. Defaults to -1 which means that first found time zone corresponding to $abbr is returned. Otherwise
		exact offset is searched and only if not found then the first time zone with any offset is returned.

	      o $isdst
		- Daylight saving time indicator. Defaults to -1, which means that whether the time zone has daylight saving or not is	not  taken
		into  consideration  when  searching.  If this is set to 1, then the $gmtOffset is assumed to be an offset with daylight saving in
		effect; if 0, then $gmtOffset is assumed to be an offset without daylight saving in effect. If $abbr doesn't exist then  the  time
		zone is searched solely by the $gmtOffset and $isdst.

RETURN VALUES
	Returns time zone name on success or FALSE on failure.

EXAMPLES
       Example #1

	      A timezone_name_from_abbr(3) example

	      <?php
	      echo timezone_name_from_abbr("CET") . "
";
	      echo timezone_name_from_abbr("", 3600, 0) . "
";
	      ?>

	      The above example will output something similar to:

	      Europe/Berlin
	      Europe/Paris

SEE ALSO
       timezone_abbreviations_list(3).

PHP Documentation Group 												TIMEZONE_NAME_FROM_ABBR(3)