php根据年月获取当月天数。

function get_day( $date )
{
$tem = explode('-' , $date);       //切割日期  得到年份和月份
$year = $tem['0'];
$month = $tem['1'];
if( in_array($month , array( 1 , 3 , 5 , 7 , 8 , 01 , 03 , 05 , 07 , 08 , 10 , 12)))
{
// $text = $year.'年的'.$month.'月有31天';
$text = '31';
}
elseif( $month == 2 )
{
if ( $year%400 == 0  || ($year%4 == 0 && $year%100 !== 0) )        //判断是否是闰年
{
// $text = $year.'年的'.$month.'月有29天';
$text = '29';
}
else{
// $text = $year.'年的'.$month.'月有28天';
$text = '28';
}
}
else{

// $text = $year.'年的'.$month.'月有30天';
$text = '30';
}
return $text;
}

echo get_day('2016-8-1');

/**
* 获取当月天数
* @param  $date
* @param  $rtype  1天数 2具体日期数组
* @return
*/
function get_day( $date ,$rtype = '1')
{
$tem = explode('-' , $date);       //切割日期  得到年份和月份
$year = $tem['0'];
$month = $tem['1'];
if( in_array($month , array( 1 , 3 , 5 , 7 , 8 , 01 , 03 , 05 , 07 , 08 , 10 , 12)))
{
// $text = $year.'年的'.$month.'月有31天';
$text = '31';
}
elseif( $month == 2 )
{
if ( $year%400 == 0  || ($year%4 == 0 && $year%100 !== 0) )        //判断是否是闰年
{
// $text = $year.'年的'.$month.'月有29天';
$text = '29';
}
else{
// $text = $year.'年的'.$month.'月有28天';
$text = '28';
}
}
else{

// $text = $year.'年的'.$month.'月有30天';
$text = '30';
}

if ($rtype == '2') {
for ($i = 1; $i <= $text ; $i ++ ) {
$r[] = $year."-".$month."-".$i;
}
} else {
$r = $text;
}
return $r;
}

var_dump(get_day('2016-8-1','2'));