Get Last four week (start and end date)

get current date

$custom_date = strtotime( date('Y-m-d') );

Last week date on Monday and Sunday.

$week_start1 = date('Ymd', strtotime('last week last monday', $custom_date));
$week_end1 = date('Ymd', strtotime('last week next sunday', $custom_date));

Second Last week date on Monday and Sunday.

$week_start2 = date('Ymd', strtotime('last week last monday -7 days', $custom_date));
$week_end2 = date('Ymd', strtotime('last week next sunday -7 days', $custom_date));

Third Last week date on Monday and Sunday.

$week_start3 = date('Ymd', strtotime('last week last monday -14 days', $custom_date));
$week_end3 = date('Ymd', strtotime('last week next sunday -14 days', $custom_date));

Fourth Last week date on Monday and Sunday.

$week_start4 = date('Ymd', strtotime('last week last monday -21 days', $custom_date));
$week_end4 = date('Ymd', strtotime('last week next sunday -21 days', $custom_date));

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