我试图显示空闲时隙。
基于下面的数据,基本上我们需要找到一种在开放时间内显示未预订时段的方法。作为一个人似乎很容易做,但是对它进行编程...老实说我只是疯了:D
// open hours --------++++--++++----- [[08:00,12:00], [14:00,18:00]]
// booked slots ---------++----+------- [[09:00,11:00], [15:00,16:00]]
// expected --------+--+--+-++----- [[08,09], [11,12], [14,15], [16,18]]
为清楚起见,我省略了几分钟,它将在实际程序中显示。
我准备了一个小提琴,以:https://ideone.com/Z9pPi3
<?php
$opening_hours = [['08:00','12:00'], ['14:00','18:00']];
$occupied_slots = [['09:30','14:00'], ['15:10','16:35']];
$expected_result = [['08:00','09:30'], ['11:00','12:00'], ['14:00','15:10'], ['16:35','18:00']];
$valid_timeslots = [];
# - - - - - - - - helper functions
function timestring_to_time($hh_mm) {
return (int) strtotime("1970-01-01 $hh_mm");
}
function timestring_diff($hh_mm_start, $hh_mm_end) {
return abs(timestring_to_time($hh_mm_end) - timestring_to_time($hh_mm_start));
}
# find empty timeslots during opening hours given occupied slots
# H E R E G O E S T H E M A G I C
var_dump($valid_timeslots);
我试图用if / else方法解决,但实际上不起作用...需要某种递归函数。
答案 0 :(得分:1)
这是我的解决方案-我假设时间间隔的第一个小时,例如['08:00','12:00']总是小于第二个小时。我编写自己的过程而不是使用您的timestring_to_time
和timestring_diff
来将时间转换为数字-timeToNum
和numToTime
(您可以轻松地将它们扩展为包括秒:{{1 }},num=3600*hour + 60*min + sec
):
sec=num%60, h=floor(num/3600), min=floor((num-h*3600)/60)
工作示例HERE。
通过从<?php
$opening_hours = [['08:00','12:00'], ['14:00','18:00']];
$occupied_slots = [['09:30','11:00'], ['15:10','16:35']];
$expected_result = [['08:00','09:30'], ['11:00','12:00'], ['14:00','15:10'], ['16:35','18:00']];
$valid_timeslots = [];
#find empty timeslots during opening hours given occupied slots
function timeToNum($time) {
preg_match('/(\d\d):(\d\d)/', $time, $matches);
return 60*$matches[1] + $matches[2];
}
function numToTime($num) {
$m = $num%60;
$h = intval($num/60) ;
return ($h>9? $h:"0".$h).":".($m>9? $m:"0".$m);
}
// substraction interval $b=[b0,b1] from interval $a=[a0,a1]
function sub($a,$b)
{
// case A: $b inside $a
if($a[0]<=$b[0] and $a[1]>=$b[1]) return [ [$a[0],$b[0]], [$b[1],$a[1]] ];
// case B: $b is outside $a
if($b[1]<=$a[0] or $b[0]>=$a[1]) return [ [$a[0],$a[1]] ];
// case C: $a inside $b
if($b[0]<=$a[0] and $b[1]>=$a[1]) return [[0,0]]; // "empty interval"
// case D: left end of $b is outside $a
if($b[0]<=$a[0] and $b[1]<=$a[1]) return [[$b[1],$a[1]]];
// case E: right end of $b is outside $a
if($b[1]>=$a[1] and $b[0]>=$a[0]) return [[$a[0],$b[0]]];
}
// flat array and change numbers to time and remove empty (zero length) interwals e.g. [100,100]
// [[ [167,345] ], [ [433,644], [789,900] ]] to [ ["07:00","07:30"], ["08:00","08:30"], ["09:00","09:30"] ]
// (number values are not correct in this example)
function flatAndClean($interwals) {
$result = [];
foreach($interwals as $inter) {
foreach($inter as $i) {
if($i[0]!=$i[1]) {
//$result[] = $i;
$result[] = [numToTime($i[0]), numToTime($i[1])];
}
}
}
return $result;
}
// calculate new_opening_hours = old_opening_hours - occupied_slot
function cutOpeningHours($op_h, $occ_slot) {
foreach($op_h as $oh) {
$ohn = [timeToNum($oh[0]), timeToNum($oh[1])];
$osn = [timeToNum($occ_slot[0]), timeToNum($occ_slot[1])];
$subsn[] = sub($ohn, $osn);
}
return $subsn;
}
$oph = $opening_hours;
foreach($occupied_slots as $os) {
$oph = flatAndClean(cutOpeningHours($oph, $os ));
}
$valid_timeslots = $oph;
var_dump(json_encode(["result"=>$valid_timeslots]));
中减去一个占用的时隙来计算$new_opening_hours
。并对每个广告位重复该操作(每次获取新的Oppening Hours数组)
要减去两个互惠对象I:
$old_opening_hours
08*60+30 = 510
函数)-例如[500,800]-[600,700] = [[500,600] ,[700,800]],您可以通过在每次迭代时不转换时间数,但在开始时对每个输入数据进行转换,而在结束时对每个输出数据进行转换,对方法进行一些改进。也许您可以减少sub
函数中的条件数量-但是当前版本非常清楚。