php中，获取指定日期的当月天数

<span>//这里以2015年11月为例</span><span>$inputs</span>[<span>'month'</span>] = <span>'201511'</span>;<span>//传递过来的参数</span><span>$tmp_month</span> = <span>$inputs</span>[<span>'month'</span>].<span>"01"</span>;
<span>//$tmp_month = '20151101';</span><span>$s_time</span> = strtotime(<span>$tmp_month</span>);<span>//月起始时间</span><span>$e_time</span> = strtotime(<span>date</span>(<span>"Ymd"</span>,<span>$s_time</span>).<span>'+1 month'</span>);<span>//月结束时间</span><span>$countMins</span> = (<span>$e_time</span> - <span>$s_time</span>)/<span>60</span>;<span>//当月分钟数</span><span>$countDay</span> = <span>$countMins</span>/(<span>60</span><span>*24</span>);<span>//当月的天数</span>

但是现在，发现了更好的获取方法。

<span>$tmp_month</span> = <span>$inputs</span>[<span>'month'</span>].<span>"01"</span>;
<span>$countDay</span> = date(<span>"t"</span>,strtotime(<span>$tmp_month</span>));
<span>//</span>如果直接date(<span>"t"</span>)，得到的是当月的天数

其实，还有一个方法，使用cal_days_in_month()函数，php手册中给的解释是：返回某个历法中某年中某月的天数。

<span>$num</span> = cal_days_<span>in</span>_month(CAL_GREGORIAN, <span>11</span>, <span>2015</span>); // <span>30</span>