


PHP formatted timestamp display friendly time implementation ideas and codes
In the project, the time is always displayed as 2014-10-20 10:22, which seems very dull. On websites such as Weibo and QQ Space, the time is usually displayed as a few seconds ago, a few minutes ago, a few hours ago, etc. that are easy to read. We call this a friendly time format. So how to implement it using php?
The general idea is as follows:
If it is a New Year's Eve and it is greater than 3 days, it will be displayed as the specific time
If it were today
If it is within one minute, it will show how many seconds ago it was
If it is within one hour, it will display a few minutes ago
If it is the current day and is greater than one hour, it will be displayed as a few hours ago
If it is yesterday, the time will be displayed as yesterday
If it is the day before yesterday, it will display the time the day before yesterday
If it is more than three days (no New Year span), it will display the day of the month
Based on the above ideas, it is not difficult to write the implementation code:
The implementation code is as follows:
//Format friendly display time
Function formatTime($time){
$now=time();
$day=date('Y-m-d',$time);
$today=date('Y-m-d');
$dayArr=explode('-',$day);
$todayArr=explode('-',$today);
//The number of days in the distance. This method may not be accurate if it exceeds 30 days, but it is accurate within 30 days, because a month may be 30 or 31 days
$days=($todayArr[0]-$dayArr[0])*365+(($todayArr[1]-$dayArr[1])*30)+($todayArr[2]-$dayArr[ 2]);
//Distance in seconds
$secs=$now-$time;
if($todayArr[0]-$dayArr[0]>0 && $days>3){//Crossing the year and more than 3 days
return date('Y-m-d',$time);
}else{
if($days
if($secs
elseif($secs
else return floor($secs/3600)."hours ago";
}else if($days
$hour=date('h',$time);
Return "yesterday".$hour.'point';
}elseif($days
$hour=date('h',$time);
Return "the day before yesterday".$hour.'point';
}else{//Three days ago
return date('m month d',$time);
}
}
}

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。

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。

在PHP中,可以利用implode()函数的第一个参数来设置没有分隔符,该函数的第一个参数用于规定数组元素之间放置的内容,默认是空字符串,也可将第一个参数设置为空,语法为“implode(数组)”或者“implode("",数组)”。


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