做了一个php的实例
是一个万年历的php
调用date（）调取时间还有循环结构的运用
这是界面很简陋但是基本的功能就是这样了
废话不多说上代码
<html><head><title>万年历</title><meta charset="utf-8"></head><body><center> ???<?php ???????$year=empty($_GET[‘y‘])?date("Y"):$_GET[‘y‘]; ???????$mon=empty($_GET[‘m‘])?date("m"):$_GET[‘m‘]; ???????????????echo "<h1>{$year}年{$mon}月</h1>"; ????????????> ???????????<table width="600" border="1"> ???????????<tr> ???????????????<th>星期日</th> ???????????????<th>星期一</th> ???????????????<th>星期二</th> ???????????????<th>星期三</th> ???????????????<th>星期四</th> ???????????????<th>星期五</th> ???????????????<th>星期六</th> ???????????</tr> ???????????<?php ???????????????$day=date("t",mktime(0,0,0,$mon,1,$year)); ???????????????$w=date("w",mktime(0,0,0,$mon,1,$year)); ???????????????$xq = 1; ???????????????while ($xq<=$day) { ????????????????????echo "<tr>"; ????????????????????for ($i=0; $i <= 6; $i++) { ????????????????????if ($xq>$day||($w>$i && $xq==1)) { ??????????????????????????echo "<td> </td>"; ?????????????????????}else{ ?????????????????????????echo "<td>{$xq}</td>"; ????????????????????????$xq++; ???????????????????????} ???????????????????} ????????????????????echo "<tr>"; ???????????????????????????????????} ???????????????echo "</table><hr/>"; ???????????????$nyear=$year;//下一年 ???????????????$pyear=$year;//上一年 ???????????????$nmon=$mon+1; ???????????????$pmon=$mon-1; ???????????????if ($nmon>12) { ???????????????????$nyear=$year+1; ???????????????????$nmon=1; ???????????????} ???????????????if ($pmon<1) { ???????????????????$pyear=$year-1; ???????????????????$pmon=12; ???????????????} ???????????????echo "<a href=‘date.php?y={$pyear}&m={$pmon}‘>上一月</a>"; ???????????????echo " "; ???????????????echo "<a href=‘date.php?y={$nyear}&m={$nmon}‘>下一月</a>"; ????????????> ???????????</center></body></html>上面的.
empty（xx1）?xx2:xx3;
是一个三元运算符
大概的意思是
如果xx1是有值的那么执行xx2，如果xx1为空那么执行xx3；
还有empty的用法
date（）的介绍
下面是PHP手册中文版的链接多看下有收获
链接：https://pan.baidu.com/s/1bPTK11wr79fDD3KcKm9q_Q 密码：xfid
今天我有重拾php了
原文地址：https://www.cnblogs.com/id652084176/p/8886366.html