Many PHP novices may be confused when they first learn, not knowing what PHP can do and how to do it. This article uses PHP to write a perpetual calendar function so that everyone can learn how to use PHP.
The key points of using PHP to implement the perpetual calendar function:
Get the total number of days in the current month to be processed $days
Get the day of the week that the first day of the month to be processed is $dayofweek
The role of $days: knowing how many days there are in the month to be processed, you can output the number of days through a loop
The role of $dayofweek: only if you know that the 1st of each month is a week How many spaces (blanks) need to be output before outputting the number of days
The code of "perpetual calendar class" is as follows:
<?php /** * PHP万年历 * @author Fly 2012/10/16 */ class Calendar{ protected $_table;//table表格 protected $_currentDate;//当前日期 protected $_year; //年 protected $_month; //月 protected $_days; //给定的月份应有的天数 protected $_dayofweek;//给定月份的 1号 是星期几 /** * 构造函数 */ public function __construct() { $this->_table=""; $this->_year = isset($_GET["y"])?$_GET["y"]:date("Y"); $this->_month = isset($_GET["m"])?$_GET["m"]:date("m"); if ($this->_month>12){//处理出现月份大于12的情况 $this->_month=1; $this->_year++; } if ($this->_month<1){//处理出现月份小于1的情况 $this->_month=12; $this->_year--; } $this->_currentDate = $this->_year.'年'.$this->_month.'月份';//当前得到的日期信息 $this->_days = date("t",mktime(0,0,0,$this->_month,1,$this->_year));//得到给定的月份应有的天数 $this->_dayofweek = date("w",mktime(0,0,0,$this->_month,1,$this->_year));//得到给定的月份的 1号 是星期几 } /** * 输出标题和表头信息 */ protected function _showTitle() { $this->_table="<table><thead><tr align='center'><th colspan='7'>".$this->_currentDate."</th></tr></thead>"; $this->_table.="<tbody><tr>"; $this->_table .="<td style='color:red'>星期日</td>"; $this->_table .="<td>星期一</td>"; $this->_table .="<td>星期二</td>"; $this->_table .="<td>星期三</td>"; $this->_table .="<td>星期四</td>"; $this->_table .="<td>星期五</td>"; $this->_table .="<td style='color:red'>星期六</td>"; $this->_table.="</tr>"; } /** * 输出日期信息 * 根据当前日期输出日期信息 */ protected function _showDate() { $nums=$this->_dayofweek+1; for ($i=1;$i<=$this->_dayofweek;$i++){//输出1号之前的空白日期 $this->_table.="<td> </td>"; } for ($i=1;$i<=$this->_days;$i++){//输出天数信息 if ($nums%7==0){//换行处理:7个一行 $this->_table.="<td>$i</td></tr><tr>"; }else{ $this->_table.="<td>$i</td>"; } $nums++; } $this->_table.="</tbody></table>"; $this->_table.="<h3><a href='?y=".($this->_year)."&m=".($this->_month-1)."'>上一月</a> "; $this->_table.="<a href='?y=".($this->_year)."&m=".($this->_month+1)."'>下一月</a></h3>"; } /** * 输出日历 */ public function showCalendar() { $this->_showTitle(); $this->_showDate(); echo $this->_table; } } $calc=new Calendar(); $calc->showCalendar();
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php把负数转为正整数的方法:1、使用abs()函数将负数转为正数,使用intval()函数对正数取整,转为正整数,语法“intval(abs($number))”;2、利用“~”位运算符将负数取反加一,语法“~$number + 1”。

实现方法:1、使用“sleep(延迟秒数)”语句,可延迟执行函数若干秒;2、使用“time_nanosleep(延迟秒数,延迟纳秒数)”语句,可延迟执行函数若干秒和纳秒;3、使用“time_sleep_until(time()+7)”语句。

php除以100保留两位小数的方法:1、利用“/”运算符进行除法运算,语法“数值 / 100”;2、使用“number_format(除法结果, 2)”或“sprintf("%.2f",除法结果)”语句进行四舍五入的处理值,并保留两位小数。

判断方法:1、使用“strtotime("年-月-日")”语句将给定的年月日转换为时间戳格式;2、用“date("z",时间戳)+1”语句计算指定时间戳是一年的第几天。date()返回的天数是从0开始计算的,因此真实天数需要在此基础上加1。

php字符串有下标。在PHP中,下标不仅可以应用于数组和对象,还可应用于字符串,利用字符串的下标和中括号“[]”可以访问指定索引位置的字符,并对该字符进行读写,语法“字符串名[下标值]”;字符串的下标值(索引值)只能是整数类型,起始值为0。

方法:1、用“str_replace(" ","其他字符",$str)”语句,可将nbsp符替换为其他字符;2、用“preg_replace("/(\s|\ \;||\xc2\xa0)/","其他字符",$str)”语句。

php判断有没有小数点的方法:1、使用“strpos(数字字符串,'.')”语法,如果返回小数点在字符串中第一次出现的位置,则有小数点;2、使用“strrpos(数字字符串,'.')”语句,如果返回小数点在字符串中最后一次出现的位置,则有。

在php中,可以使用substr()函数来读取字符串后几个字符,只需要将该函数的第二个参数设置为负值,第三个参数省略即可;语法为“substr(字符串,-n)”,表示读取从字符串结尾处向前数第n个字符开始,直到字符串结尾的全部字符。


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