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PHP 日期格式化和日期计算以及当获取前周、月头尾日期

PHP 日期格式化示例代码：

/*** 格式化时间* $type:类型* $strDate：需要处理的时间字符串** 年份 Y：四位年份y：两位年份* 月份 m: 两位数字月份 n: 一位数字月份 M：英文月* 日期 d：两位数字日期 j:一位数字日期 D:英文日期* 时：H 、分:i 、秒：s**/ public function GetFormatDate($type = 1,$strDate=\){ $time = time(); if(isset($strDate) && !empty($strDate)){$time = strtotime($strDate); } switch($type){case 1: return date("H:i",$time);case 2: return date("m月d日 H:i",$time);case 3: return date("m/d H:i",$time);case 4: return date("Y年m月d日 H:i",$time);case 5: return date("Y/m/d H:i",$time);case 6: return date("Y年m月d日 H:i:s",$time);case 7: return date("Y-m-d H:i:s",$time);case 8: return date("Y/m/d H:i:s",$time);default: return $strDate; } }

日期计算示例代码：

/*** 时间加减处理* $strDate：需要处理的时间字符串* $days： 加减天数**/ public function ChangeDate($strDate,$days){$time = time();if(isset($strDate) && !empty($strDate)){ $time = strtotime($strDate);} return date(Y-m-d H:i:s,strtotime("$days day",$time)); }

获取当前周、月头尾日期示例代码：

/** * 获取当前周、月的头尾日期 * * $dateArr[W1]:周一 * $dateArr[W7]:周末 * $dateArr[M1]:月头 * $dateArr[M2]:月尾 **/ public function GetCurrentDateInfo(){ $dayTimes = 24*60*60; $dateArr = [];$temp = \; $weekIndex = (int)date(w); switch($weekIndex){ case 0: $dateArr[W1] = date(Y-m-d 00:00:00,strtotime(+1 day)); $dateArr[W7] = date(Y-m-d 23:59:59,strtotime(+7 day)); break; case 1: $dateArr[W1] = date(Y-m-d 00:00:00); $dateArr[W7] = date(Y-m-d 23:59:59,strtotime(+6 day)); break; case 2: $dateArr[W1] = date(Y-m-d 00:00:00,strtotime(-1 day)); $dateArr[W7] = date(Y-m-d 23:59:59,strtotime(+5 day)); break; case 3: $dateArr[W1] = date(Y-m-d 00:00:00,strtotime(-2 day)); $dateArr[W7] = date(Y-m-d 23:59:59,strtotime(+4 day)); break; case 4: $dateArr[W1] = date(Y-m-d 00:00:00,strtotime(-3 day)); $dateArr[W7] = date(Y-m-d 23:59:59,strtotime(+3 day)); break; case 5: $dateArr[W1] = date(Y-m-d 00:00:00,strtotime(-4 day)); $dateArr[W7] = date(Y-m-d 23:59:59,strtotime(+2 day)); break; case 6: $dateArr[W1] = date(Y-m-d 00:00:00,strtotime(-5 day)); $dateArr[W7] = date(Y-m-d 23:59:59,strtotime(+1 day)); break; } //1-12：一月 至 十二月 $monthIndex = (int)date(m); switch($monthIndex){ case 1: $temp = date(Y-02-01 00:00:00); $dateArr[M1] = date(Y-m-01 00:00:00); $dateArr[M2] = date(Y-m-d 23:59:59,strtotime($temp)-$dayTimes); break; case 2: $temp = date(Y-03-01 00:00:00); $dateArr[M1] = date(Y-m-01 00:00:00); $dateArr[M2] = date(Y-m-d 23:59:59,strtotime($temp)-$dayTimes); break; case 3: $temp = date(Y-04-01 00:00:00); $dateArr[M1] = date(Y-m-01 00:00:00); $dateArr[M2] = date(Y-m-d 23:59:59,strtotime($temp)-$dayTimes); break; case 4: $temp = date(Y-05-01 00:00:00); $dateArr[M1] = date(Y-m-01 00:00:00); $dateArr[M2] = date(Y-m-d 23:59:59,strtotime($temp)-$dayTimes); break; case 5: $temp = date(Y-06-01 00:00:00); $dateArr[M1] = date(Y-m-01 00:00:00); $dateArr[M2] = date(Y-m-d 23:59:59,strtotime($temp)-$dayTimes); break; case 6: $temp = date(Y-07-01 00:00:00); $dateArr[M1] = date(Y-m-01 00:00:00); $dateArr[M2] = date(Y-m-d 23:59:59,strtotime($temp)-$dayTimes); break; case 7: $temp = date(Y-08-01 00:00:00); $dateArr[M1] = date(Y-m-01 00:00:00); $dateArr[M2] = date(Y-m-d 23:59:59,strtotime($temp)-$dayTimes); break; case 8: $temp = date(Y-09-01 00:00:00); $dateArr[M1] = date(Y-m-01 00:00:00); $dateArr[M2] = date(Y-m-d 23:59:59,strtotime($temp)-$dayTimes); break; case 9: $temp = date(Y-10-01 00:00:00); $dateArr[M1] = date(Y-m-01 00:00:00); $dateArr[M2] = date(Y-m-d 23:59:59,strtotime($temp)-$dayTimes); break; case 10: $temp = date(Y-11-01 00:00:00); $dateArr[M1] = date(Y-m-01 00:00:00); $dateArr[M2] = date(Y-m-d 23:59:59,strtotime($temp)-$dayTimes); break; case 11: $temp = date(Y-12-01 00:00:00); $dateArr[M1] = date(Y-m-01 00:00:00); $dateArr[M2] = date(Y-m-d 23:59:59,strtotime($temp)-$dayTimes); break; case 12: $temp = date((date(Y)+1)."-01-01 00:00:00"); $dateArr[M1] = date(Y-m-01 00:00:00); $dateArr[M2] = date(Y-m-d 23:59:59,strtotime($temp)-$dayTimes); break; } return $dateArr; }

以上代码仅供参考，疏漏之处还请指出以便改进！

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