Yesterday's time in PHP

Quick tip or note to self: How to get yesterday's date irrespective of date format or daylight savings time.
copyraw
$today=date("Y-m-d");
$yesterday = date('Y-m-d', mktime(0, 0, 0, date("m") , date("d") - 1, date("Y")));
  1.  $today=date("Y-m-d")
  2.  $yesterday = date('Y-m-d', mktime(0, 0, 0, date("m") , date("d") - 1, date("Y")))
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