How to get some special time nodes in PHP

1. Get the first and last day of the month

Code:

<?php
$BeginMonthDate=date(&#39;Y-m-01&#39;, strtotime(date("Y-m-d")));
echo $BeginMonthDate;
echo "<br/>";
echo date(&#39;Y-m-d&#39;, strtotime("$BeginMonthDate +1 month -1 day"));
echo "<br/>";
?>

Output ：

2021-03-01
2021-03-31

2. Get the year, month, day and number of days of the day

Code:

<?php
echo " 本月共有:".date("t")."天";
echo " 当前年份".date(&#39;Y&#39;);
echo " 当前月份".date(&#39;m&#39;);
echo " 当前几号".date(&#39;d&#39;);
echo "<br/>";
?>

Output:

本月共有:31天 当前年份2021 当前月份03 当前几号31

3. Use functions and arrays to get the first and last days of the month

Code:

function getthemonth($date) 
{ 
    $firstday = date('Y-m-01', strtotime($date)); 
    $lastday = date('Y-m-d', strtotime("$firstday +1 month -1 day"));
     return array($firstday,$lastday); 
 } 
 $today = date("Y-m-d"); 
 $day=getthemonth($today); 
 echo "当月的第一天: ".$day[0]." 当月的最后一天: ".$day[1]; 
 echo "<br/>";

Output:

当月的第一天: 2021-03-01 当月的最后一天: 2021-03-31

4. Get the first and last day of last month

Code:

<?php
//上个月第一天:
echo date(&#39;Y-m-d&#39;, strtotime(date(&#39;Y-m-01&#39;) . &#39; -1 month&#39;));// 计算出本月第一天再减一个月
echo "<br>";
//上个月最后一天:
echo date(&#39;Y-m-d&#39;, strtotime(date(&#39;Y-m-01&#39;) . &#39; -1 day&#39;)); // 计算出本月第一天再减一天
?>

Output:

2021-02-01
2021-02-28

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