for ($i=1; $i < 13; $i++) {
$date = strtotime(date("2015-$i-01"));
$firstday = date("Y-m-01",$date);
$lastday = date("Y-m-t",$date);
echo $firstday.'==='.$lastday.'<br/>';
}
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2023-10-04 21:42:40
for ($i=1; $i < 13; $i++) {
$date = strtotime(date("2015-$i-01"));
$firstday = date("Y-m-01",$date);
$lastday = date("Y-m-t",$date);
echo $firstday.'==='.$lastday.'<br/>';
}