函数： The strtotime() 功能：将任何英文文本的时间转换为UNIX时间戳（从1970年1月1日（GMT）起经过的秒数），进行一些代数运算
Parameter参数Description描述timeRequired. Specifies the time string to parse必要参数。指定需要被解析的时间字符串。nowOptional. Specifies the timestamp used to calculate the returned value. If this parameter is omitted, current time is used可选参数。指定用来计算返回值的时间戳。如果这个参数被忽略，那么将默认使用当前时间 <? php echo ( strtotime ( " now " ) . " <br /> " ); echo ( strtotime ( " 3 October 2005 " ) . " <br /> " ); echo ( strtotime ( " +5 hours " ) . " <br /> " ); echo ( strtotime ( " +1 week " ) . " <br /> " ); echo ( strtotime ( " +1 week 3 days 7 hours 5 seconds " ) . " <br /> " ); echo ( strtotime ( " next Monday " ) . " <br /> " ); echo ( strtotime ( " last Sunday " )); ?> 输出： 1138614504 1128290400 1138632504 1139219304 1139503709 1139180400 1138489200