php学习笔记（十三）时间处理与日历的实现

<?php

/**
* 时间和日期
* 1.unix时间戳
*         以32位整数表示的格林威治时间
*         时间戳是从1970年1月1日0点0分0秒到现在的开始计时
*         方便我们计算使用
*         处理的时间在1902年-2038年之内是有效的（时间戳不能为负数）
* 2.在php中获取日期和时间
*         time()
*         getDate()
*         getTimeOfDay()
*         date_sunrise()
*         date_sunset()
* 3.格式化输出
*         date($str,[timestamp]);（查看使用的符号）
* 4.将日期和时间编程unix时间戳
*         mktime($hour, $minute, $second, $month, $day, $year, $is_dst)
*         如果只想传唤日期，则前三个参数传入0即可
* 5.修改php的默认时区
*         最好服务器的时间，没半个小时与世界时间同步一下
*         php.ini 的 date.timezone
*         或者
*        ini_set("date.timezone", "ETC/GMT-8");
*        date_default_timezone_set("ETC/GMT-8");（php5特性）
* 6.使用微妙计算php脚本的执行时间
*         microtime();（带有boolean参数的是php5的新特性）
*
* 示例：日历类
*/
//设置时区（参数去查看php手册的参数列表）
//date_default_timezone_set("ETC/GMT-8");
ini_set("date.timezone", "ETC/GMT-8");

//获取时间
$time = time();
echo $time."<br>";
$date = @getDate();
var_dump($date)."<br>";
$timeofday = @getTimeOfDay();
var_dump($timeofday)."<br>";
$date_sunrise = @date_sunrise();
echo $date_sunrise."<br>";
$date_sunset = @date_sunset();
echo $date_sunset."<br>"."<br>";

//格式化日期和时间
echo @date("Y-m-d H:i:s",time())."<br>";
echo @date("Y-m-d H:i:s")."<br>"."<br>";

//转换unix时间戳
echo @date("Y-m-d H:i:s",@mktime(12,29,22))."<br>";
echo @date("Y-m-d H:i:s",@mktime(0,0,0,12,2002))."<br>";
echo @date("Y-m-d H:i:s",@mktime(0,0,0,12,36,2007))."<br>";
echo @date("Y-m-d H:i:s",@mktime(0,0,0,1,1,99))."<br>";

//计算年龄方法
@list($year,$month,$day)=@explode("-", $_GET["birthday"]);
$agestamp = time()-@mktime(0,0,0,$month,$day,$year);
$age = $agestamp/(60*60*24*365);
echo $age."<br>";

//使用微妙计算php的时间
class Time{
private $starTime;
private $stopTime;
function __construct(){
$this->starTime = 0;
$this->stopTime = 0;
}
function start(){
$this->starTime=microtime(true);
}
function stop(){
$this->stopTime=microtime(true);
}
function speat(){
//四舍五入四位
return round($this->stopTime-$this->starTime,4);
}
}
$timer = new Time();
$timer->start();
for ($i=0;$i<10000;$i++){}
$timer->stop();
echo $timer->speat();

include 'calendar.class.php';
$calendar = new Calendar();
$calendar->out();
?>
<style>
table{
border:1px;
}
.fonth{
color:white;
background:blue;
}
th{
width:30px;
}
form{
margin: 0px;
padding: 0px;
}

</style>

<?php

class Calendar{
//当月的第一天对应周几
private $star_weekday;
//当月的天数
private $days;
private $year;
private $month;
function __construct(){
$this->year=isset($_GET["year"])?$_GET["year"]:date("Y");
$this->month=isset($_GET["month"])?$_GET["month"]:date("m");
$this->star_weekday = date("w",mktime(0,0,0,$this->month,1,$this->year));
$this->days = date("t",mktime(0,0,0,$this->month,1,$this->year));
}
function out(){
echo "<table align='center'>";
$this->changeDate("date.php");
$this->weekList();
$this->dayList();
echo "</table>";
}
/**
* 循环输出星期
* Enter description here ...
*/
private function weekList(){
$week = array("日","一","二","三","四","五","六");
echo "<tr>";
for ($i=0;$i<count($week);$i++){
echo "<th class='fonth'>".$week[$i]."</th>";
}
echo "</tr>";
}
/**
* 循环输出天数
* Enter description here ...
*/
private function dayList() {
echo "<tr>";
//输出空格
for ($j=0;$j<$this->star_weekday;$j++){
echo "<td></td>";
}
for ($i=1;$i<$this->days;$i++){
$j++;
if ($i==date("d"))
echo "<th class='fonth'>".$i."</th>";
else
echo "<td>".$i."</td>";

if ($j%7==0) {
echo "</tr><tr>";;
}
}
while ($j%7==0){
echo "<td></td>";
$j++;
}
echo "</tr>";
}
private function prevYear($year,$month){
$year=$year-1;
if ($year<1970)
$year = 1970;
return "year={$year}&month={$month}";
}
private function prevMonth($year,$month){
if ($month==1){
$year=$year-1;
if ($year<1970)$year = 1970;
$month=12;
}else{
$month=$month-1;
}
return "year={$year}&month={$month}";
}
private function nextYear($year,$month){
$year=$year+1;
if ($year>2038)
$year = 2038;
return "year={$year}&month={$month}";
}
private function nextMonth($year,$month){
if ($month==12){
$year=$year+1;
if ($year>2038)$year = 2038;
$month=1;
}else{
$month=$month+1;
}
return "year={$year}&month={$month}";
}

private function changeDate($url=""){
echo "<tr>";
echo "<td><a href='?".$this->prevYear($this->year, $this->month)."'>"."<<"."</a></td>";
echo "<td><a href='?".$this->prevMonth($this->year, $this->month)."'>"."<"."</a></td>";

echo "<td colspan='3'>";
echo "<form>";
echo '<select name="year" onchange="window.location=\''.$url.'?year=\'+this.options[selectedIndex].value+\'&month='.$this->month.'\'">';
for ($y = 1970;$y<2039;$y++){
$selected = ($y==$this->year)?"selected":"";
echo "<option ".$selected." value='".$y."'>".$y."</option>";
}
echo "</select>";
echo '<select name="month"  onchange="window.location=\''.$url.'?year='.$this->year.'&month=\'+this.options[selectedIndex].value">';
for ($m = 1;$m<13;$m++){
$selected = ($m==$this->month)?"selected":"";
echo "<option ".$selected." value='".$m."'>".$m."</option>";
}
echo "</select>";
echo "</form>";
echo "</td>";

echo "<td><a href='?".$this->nextMonth($this->year, $this->month)."'>".">"."</a></td>";
echo "<td><a href='?".$this->nextYear($this->year, $this->month)."'>".">>"."</a></td>";
echo "</tr>";
}
}
?>