php 时间日期工具类
<?php DateTimeUtils::addDate('2012-12-01',1,'y'); DateTimeUtils::getWeekDay('2012/10/01','/'); DateTimeUtils::isLeapYear('2012'); class DateTimeUtils { /** * Checks for leap year, returns true if it is. No 2-digit year check. Also * handles julian calendar correctly. * @param integer $year year to check * @return boolean true if is leap year */ public static function isLeapYear($year) { $year = self::digitCheck($year); if ($year % 4 != 0) return false; if ($year % 400 == 0) return true; // if gregorian calendar (>1582), century not-divisible by 400 is not leap else if ($year > 1582 && $year % 100 == 0 ) return false; return true; } /** * Fix 2-digit years. Works for any century. * Assumes that if 2-digit is more than 30 years in future, then previous century. * @param integer $y year * @return integer change two digit year into multiple digits */ protected static function digitCheck($y) { if ($y < 100){ $yr = (integer) date("Y"); $century = (integer) ($yr /100); if ($yr%100 > 50) { $c1 = $century + 1; $c0 = $century; } else { $c1 = $century; $c0 = $century - 1; } $c1 *= 100; // if 2-digit year is less than 30 years in future, set it to this century // otherwise if more than 30 years in future, then we set 2-digit year to the prev century. if (($y + $c1) < $yr+30) $y = $y + $c1; else $y = $y + $c0*100; } return $y; } /** * Returns 4-digit representation of the year. * @param integer $y year * @return integer 4-digit representation of the year */ public static function get4DigitYear($y) { return self::digitCheck($y); } /** * Checks to see if the year, month, day are valid combination. * @param integer $y year * @param integer $m month * @param integer $d day * @return boolean true if valid date, semantic check only. */ public static function isValidDate($y,$m,$d) { return checkdate($m, $d, $y); } public static function checkDate($date, $separator = "-") { //检查日期是否合法日期 $dateArr = explode ($separator, $date); if (is_numeric ( $dateArr [0] ) && is_numeric ( $dateArr [1] ) && is_numeric ( $dateArr [2] )) { return checkdate ( $dateArr [1], $dateArr [2], $dateArr [0] ); } return false; } /** * Checks to see if the hour, minute and second are valid. * @param integer $h hour * @param integer $m minute * @param integer $s second * @param boolean $hs24 whether the hours should be 0 through 23 (default) or 1 through 12. * @return boolean true if valid date, semantic check only. * @since 1.0.5 */ public static function isValidTime($h,$m,$s,$hs24=true) { if($hs24 && ($h < 0 || $h > 23) || !$hs24 && ($h < 1 || $h > 12)) return false; if($m > 59 || $m < 0) return false; if($s > 59 || $s < 0) return false; return true; } public static function checkTime($time, $separator = ":") { //检查时间是否合法时间 $timeArr = explode ($separator, $time ); if (is_numeric ( $timeArr [0] ) && is_numeric ( $timeArr [1] ) && is_numeric ( $timeArr [2] )) { if (($timeArr [0] >= 0 && $timeArr [0] <= 23) && ($timeArr [1] >= 0 && $timeArr [1] <= 59) && ($timeArr [2] >= 0 && $timeArr [2] <= 59)) return true; else return false; } return false; } public static function addDate($date, $int, $unit = "d") { //日期的增加 $dateArr = explode ( "-", $date ); $value [$unit] = $int; return date ( "Y-m-d", mktime ( 0, 0, 0, $dateArr [1] + $value ['m'], $dateArr [2] + $value ['d'], $dateArr [0] + $value ['y'] ) ); } public static function addDayTimestamp($ntime, $aday) { //取当前时间后几天,天数增加单位为1 $dayst = 3600 * 24; $oktime = $ntime + ($aday * $dayst); return $oktime; } public static function dateDiff($date1, $date2, $unit = "d") { //时间比较函数,返回两个日期相差几秒、几分钟、几小时或几天 switch ($unit) { case 's' : $dividend = 1; break; case 'i' : $dividend = 60; break; case 'h' : $dividend = 3600; break; case 'd' : $dividend = 86400; break; default : $dividend = 86400; } $time1 = strtotime ( $date1 ); $time2 = strtotime ( $date2 ); if ($time1 && $time2) return ( float ) ($time1 - $time2) / $dividend; return false; } //2011-12-06 => public static function getWeekDay($date, $separator = "-") { //计算出给出的日期是星期几 $dateArr = explode ($separator, $date); return date ( "w", mktime ( 0, 0, 0, $dateArr [1], $dateArr [2], $dateArr [0] ) ); } public static function floorTime($seconds) { //让日期显示为:XX天XX年以前 $times = ''; $days = floor ( ($seconds / 86400) % 30 ); $hours = floor ( ($seconds / 3600) % 24 ); $minutes = floor ( ($seconds / 60) % 60 ); $seconds = floor ( $seconds % 60 ); if ($seconds >= 1) $times .= $seconds . '秒'; if ($minutes >= 1) $times = $minutes . '分钟 ' . $times; if ($hours >= 1) $times = $hours . '小时 ' . $times; if ($days >= 1) $times = $days . '天'; if ($days > 30) return false; $times .= '前'; return str_replace ( " ", '', $times ); } public static function transDateToChs($date) { if (empty ( $date )) return '今日'; $y = date ( 'Y', strtotime ( $date ) ); $m = date ( 'm', strtotime ( $date ) ); $d = date ( 'd', strtotime ( $date ) ); return $y . '年' . $m . '月' . $d . '日'; } // 08/31/2004 => 2004-08-31 public static function TransDateUI($datestr, $type = 'Y-m-d') { if ($datestr == Null) return Null; $target = $datestr; $arr_date = preg_split ( "/\//", $target ); $monthstr = $arr_date [0]; $daystr = $arr_date [1]; $yearstr = $arr_date [2]; $result = date ( $type, mktime ( 0, 0, 0, $monthstr, $daystr, $yearstr ) ); return $result; } // 12/20/2004 10:55 AM => 2004-12-20 10:55:00 public static function TransDateTimeUI($datestr, $type = 'Y-m-d H:i:s') { if ($datestr == Null) return Null; $target = $datestr; $arr_date = preg_split ( "/\/|\s|:/", $target ); $monthstr = $arr_date [0]; $daystr = $arr_date [1]; $yearstr = $arr_date [2]; $hourstr = $arr_date [3]; $minutesstr = $arr_date [4]; $result = date ( $type, mktime ( $hourstr, $minutesstr, 0, $monthstr, $daystr, $yearstr ) ); return $result; } // 2004-08-31 => 08/31/2004 public static function TransDateDB($datestr, $type = 'm/d/Y') { if ($datestr == Null) return Null; if ($datestr == '0000-00-00') return Null; $target = $datestr; $arr_date = preg_split ( "/-/", $target ); $monthstr = $arr_date [1]; $daystr = $arr_date [2]; $yearstr = $arr_date [0]; $result = date ( $type, mktime ( 0, 0, 0, $monthstr, $daystr, $yearstr ) ); return $result; } // 2004-08-31 10:55:00 => 12/20/2004 10:55 AM public static function TransDateTimeDB($datestr, $type = 'm/d/Y h:i A') { if ($datestr == Null) return Null; $target = $datestr; $arr_date = preg_split ( "/-|\s|:/", $target ); $monthstr = $arr_date [1]; $daystr = $arr_date [2]; $yearstr = $arr_date [0]; $hourstr = $arr_date [3]; $minutesstr = $arr_date [4]; $secondstr = $arr_date [5]; $result = date ( $type, mktime ( $hourstr, $minutesstr, $secondstr, $monthstr, $daystr, $yearstr ) ); return $result; } } ?>?

要保护应用免受与会话相关的XSS攻击,需采取以下措施:1.设置HttpOnly和Secure标志保护会话cookie。2.对所有用户输入进行输出编码。3.实施内容安全策略(CSP)限制脚本来源。通过这些策略,可以有效防护会话相关的XSS攻击,确保用户数据安全。

优化PHP会话性能的方法包括:1.延迟会话启动,2.使用数据库存储会话,3.压缩会话数据,4.管理会话生命周期,5.实现会话共享。这些策略能显着提升应用在高并发环境下的效率。

thesession.gc_maxlifetimesettinginphpdeterminesthelifespanofsessiondata,setInSeconds.1)它'sconfiguredinphp.iniorviaini_set().2)abalanceIsiseededeedeedeedeedeedeedto to to avoidperformance andununununununexpectedLogOgouts.3)

在PHP中,可以使用session_name()函数配置会话名称。具体步骤如下:1.使用session_name()函数设置会话名称,例如session_name("my_session")。2.在设置会话名称后,调用session_start()启动会话。配置会话名称可以避免多应用间的会话数据冲突,并增强安全性,但需注意会话名称的唯一性、安全性、长度和设置时机。

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在PHP中设置会话cookie参数可以通过session_set_cookie_params()函数实现。1)使用该函数设置参数,如过期时间、路径、域名、安全标志等;2)调用session_start()使参数生效;3)根据需求动态调整参数,如用户登录状态;4)注意设置secure和httponly标志以提升安全性。

在PHP中使用会话的主要目的是维护用户在不同页面之间的状态。1)会话通过session_start()函数启动,创建唯一会话ID并存储在用户cookie中。2)会话数据保存在服务器上,允许在不同请求间传递数据,如登录状态和购物车内容。

如何在子域名间共享会话?通过设置通用域名的会话cookie实现。1.在服务器端设置会话cookie的域为.example.com。2.选择合适的会话存储方式,如内存、数据库或分布式缓存。3.通过cookie传递会话ID,服务器根据ID检索和更新会话数据。


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