这篇文章主要介绍了一个比较不错的PHP日历类分享,本文直接给出了实现的类代码和使用方法示例,需要的朋友可以参考下
说到对时期和时间的处理,就一定要介绍一下日历程序的编写。但一提起编写日历,大多数人都会认为日历的作用只是为了在页上显示当前的日期,其实日历在我们的开发中有更重要的作用。例如我们开发一个“记事本”就需要通过日历设定日期,还有一些系统中需要按日期去排任务,也需要日历,等等。本例涉及的日期和时间函数并不是很多,都是前面介绍的内容,主要是通过一个日历类的编写,巩固一下前面介绍过的面向对象的语法知识,以及时间函数应用,最主要的是可以提升初学者的思维逻辑和程序设计能力。将日历类Calendar声明在文件calendar.class.php中,代码如下所示:
year = isset($_GET["year"]) ? $_GET["year"] : date("Y"); //如果用户没有设置月份数,则使用当前系统时间的月份 $this->month = isset($_GET["month"]) ? $_GET["month"] : date("m"); //通过具体的年份和月份,利用date()函数的w参数获取当月第一天对应的是周几 $this->start_weekday = date("w",mktime(0,0,0,$this->month,1,$this->year)); //通过具体的年份和月份,利用date()函数的t参数获取当月的天数 $this->days = date("t",mktime(0,0,0,$this->month,1,$this->year)); } //魔术方法用于打印整个日历 function __toString(){ $out .='

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。

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。

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。

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。


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