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// first set the timezone to where ever you want.
date_default_timezone_set('Asia/Kolkata');
// get the Date of the present date in the below format change the format if required.
$date = date('Y-m-d');

// get the week number by giving the date there ate 0-52 weeks in a year.
$date = date("W", strtotime('2019-01-01'));