PHP 八个时间函数介绍
1、date
用法: date(格式,[时间]);
如果没有时间参数,则使用当前时间. 格式是一个字符串,其中以下字符有特殊意义:
U 替换成从一个起始时间(好象是1970年1月1日)以来的秒数Y 替换成4位的年号.
y 替换成2位的年号.
F 替换成月份的英文全称.
M 替换成月份的英文简称.
m 替换成月份数.
z 替换成从当年1月1日以来的天数.
d 替换成日数.
l 替换成星期几的英文全称.
D 替换成星期几的英文简称.
w 替换成星期几(数字).
H 替换成小时数(24小时制).
h 替换成小时数(12小时制).
i 替换成分钟数.
s 替换成秒数.
A 替换成"AM"或"PM".
a 替换成"am"或"pm".
S 替换成序数字后缀,例如:"st","nd","rd","th".
函数返回作过了替换的格式串.
2、getdate(时间)
返回一个哈希表,各下标是:
"seconds" -- 秒数
"minutes" -- 分数
"hours" -- 小时数
"mday" -- 日数
"mon" -- 月份数
"year" -- 年号
"yday" -- 1月1日以来的天数
"weekday" -- 星期几,英文全称
"month" -- 月份,英文全名
3、gmdate
与date类似,但先将时间转换成格林威治标准时.
4、mktime
用法: mktime(小时数,分数,秒数,月,日,年); 返回一个时间值,可用于其他函数.
5、time
用法:time(); 返回1970年1月1日零点以来的秒数.
6、microtime
用法:
microtime(); 返回一个字符串,用空格分成两部分,后一部分相当于time()
的返回值,前一部分是微秒数.
7、checkdate
checkdate(月,日,年); 返回逻辑真或逻辑假. 如果:
1. 年在1900和32767之间(包括1900与32767);
2. 月在1到12之间;
3. 日在该月的允许日数范围内(考虑了闰年);
则返回逻辑真.
8、set_time_limit
用法: set_time_limit(秒数);

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