- date: documentation ( source)
- strtotime: documentation ( source)
<?php
$aCampaign['date_time'] = '2014-04-23 13:00:00';
if(date('D') == 'Mon'){
$sDate = date('Y-m-d 00:00:00', strtotime('-3 days'));
} else {
$sDate = date('Y-m-d 00:00:00', strtotime('yesterday'));
}
if($aCampaign['date_time'] > $sDate){
echo 1;
} else {
echo 0;
}