how to get date of yesterday using php?

If you define the timezone in your PHP app (as you should), which you can do this way:

date_default_timezone_set('Europe/Paris');

Then it's as simple as:

$yesterday = new DateTime('yesterday'); // will use our default timezone, Paris
echo $yesterday->format('Y-m-d'); // or whatever format you want

(You may want to define a constant or environment variable to store your default timezone.)

Yesterday Date in PHP:

echo date("Y-m-d", strtotime("yesterday")); 

try this

        $tz    = new DateTimeZone('Your Time Zone');
        $date  = new DateTime($today,$tz);
        $interval = new DateInterval('P1D');
        $date->sub($interval); 

        echo $date->format('d.m.y');

        ?>           

there you go

date('d.m.Y',strtotime("-1 days"));

this will work also if month change