$date = #תאריך#;
$dayOfWeek = date(‘l’, strtotime($date));

if ($dayOfWeek == ‘Thursday’ || $dayOfWeek == ‘Friday’) {
return date(‘d/m/Y’, strtotime(‘-6 days’, strtotime($date)));
} elseif ($dayOfWeek == ‘Saturday’) {
return date(‘d/m/Y’, strtotime(‘-5 days’, strtotime($date)));
} else {
return date(‘d/m/Y’, strtotime(‘-4 days’, strtotime($date)));
}