PHP输出时间差函数
复制代码 代码如下:
date_default_timezone_set('PRC'); //默认时区
echo "今天:",date("Y-m-d",time()),"
";
echo "今天:",date("Y-m-d",strtotime("18 june 2008")),"
";
echo "昨天:",date("Y-m-d",strtotime("-1 day")), "
";
echo "明天:",date("Y-m-d",strtotime("+1 day")), "
";
echo "一周后:",date("Y-m-d",strtotime("+1 week")), "
";
echo "一周零两天四小时两秒后:",date("Y-m-d G:H:s",strtotime("+1 week 2 days 4 hours 2 seconds")), "
";
echo "下个星期四:",date("Y-m-d",strtotime("next Thursday")), "
";
echo "上个周一:".date("Y-m-d",strtotime("last Monday"))."
";
echo "一个月前:".date("Y-m-d",strtotime("last month"))."
";
echo "一个月后:".date("Y-m-d",strtotime("+1 month"))."
";
echo "十年后:".date("Y-m-d",strtotime("+10 year"))."
";
?>
在学习PHP 的时候,经常会用到获取现在之前或之后,某个时间段的日期。现在已经进行收集,大家同时也可以进行扩展丰富
复制代码 代码如下:
//获取当天的星期(1-7)
function GetWeek($times)
{
$res = date('w', strtotime($times));
if($res==0)
$res=7;
return $res;
}
//获取当天时间
function GetTime($times)
{
$res = date('H:i', strtotime($times));
return $res;
}
//获取现在过几月的的时间
function GetMonth($Month,$type='l')
{
if(!strcmp($type,'b'))
$res=date("Y-m-d H:i:s",strtotime("-$Month months"));
if(!strcmp($type,'l'))
$res=date("Y-m-d H:i:s",strtotime("+$Month months"));
return $res;
}
//获取当前时间
function GetCurrentDateTime()
{
$res=date("Y-m-d H:i:s",time());
return $res;
}
//获取当前时间隔几小时之前或之后的时间
function GetDiffHours($hours,$type='l')
{
if(!strcmp($type,'b'))
$res=date("Y-m-d H:i:s",strtotime("-$hours hour"));
if(!strcmp($type,'l'))
$res=date("Y-m-d H:i:s",strtotime("+$hours hour"));
return $res;
}
//间隔几分钟之前或之后的时间
function GetDiffMinute($Minute,$type='l')
{
if(!strcmp($type,'b'))
$res=date("Y-m-d H:i:s",strtotime("-$Minute minute"));
if(!strcmp($type,'l'))
$res=date("Y-m-d H:i:s",strtotime("+$Minute minute"));
return $res;
}
//间隔几秒之前或之后的时间
function GetDiffSec($sec,$type='l')
{
if(!strcmp($type,'b'))
$res=date("Y-m-d H:i:s",strtotime("-$sec second"));
if(!strcmp($type,'l'))
$res=date("Y-m-d H:i:s",strtotime("+$sec second"));
return $res;
}
//间隔几个星期之前或之后的时间
function GetDiffWeek($Week,$type='l')
{
if(!strcmp($type,'b'))
$res=date("Y-m-d H:i:s",strtotime("-$Week week"));
if(!strcmp($type,'l'))
$res=date("Y-m-d H:i:s",strtotime("+$Week week"));
return $res;
}
// 间隔几天之间的时间
function GetDiffDays($days,$type='l')
{
if(!strcmp($type,'b'))
$res=date("Y-m-d H:i:s",strtotime("-$days day"));
if(!strcmp($type,'l'))
$res=date("Y-m-d H:i:s",strtotime("+$days day"));
return $res;
}
//间隔几年之前或之后的时间
function GetDiffYears($year,$type='l')
{
if(!strcmp($type,'b'))
$res=date("Y-m-d H:i:s",strtotime("-$year year"));
if(!strcmp($type,'l'))
$res=date("Y-m-d H:i:s",strtotime("+$year year"));
return $res;
}

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。

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。

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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