php - How to find the difference between campaign dates and filter date -


i have 4 dates me, 2 campaign 1 of them campaign start date , other 1 campaign end date , same thing goes filter dates. want check how many days campaign runs in between given filter start date , filter end date . using these conditions 

if ($datecs != false && $datece != false && $datefs != false && $datefe != false) {     if( ($datecs >= $datefs) && ($datece <= $datefe)) {         // campaign start , end date between filterdates         $tot_days = $this->get_days($datecs,$datece);         if($tot_days != 'ok'){                 return $tot_days;         } else {                 return 0;         }     } elseif (($datecs <= $datefs) && ($datece >= $datefe)) {         //filterdates between campiagn start , end         $tot_days = $this->get_days($datefs,$datefe);         if($tot_days != 'ok'){             return $tot_days;         } else {             return 0;         }     } elseif(($datecs <= $datefs ) && ( $datece <= $datefe ) && ($datece >= $datefs)) {         // campaign end date between filterdates         $tot_days = $this->get_days($datefs,$datece);         if ($tot_days != 'ok'){             return $tot_days;         } else {             return 0;         }     } elseif(( $datecs>= $datefs) && ($datece >= $datefe) && ($datecs <= $datefe )) {         // campaign start date between filterdates         $tot_days = $this->get_days($datecs,$datefe);         if (($tot_days != 'ok')) {             return $tot_days;         } else {             return 0;         }     } }

datecs campaign start date , datece campaign end date .datefs filter start date , datefe filter end date. , get_days function gets me number of days get_days function using

function get_days($date1,$date2)     {         if($date2 > $date1)         {             $interval = $date1->diff($date2);             return $interval->days+1;             //we add 1 because not calculate starting date if substract.              //it give number of days reach last date.         } else if($date2 = $date1) {             return 1;         }         else         {             return "ok";         }     }

please let me know if going wrong where.

i rewrite get_days function :

function get_days($date1,$date2) {   if($date2 < $date1)   {     $interval = $date1->diff($date2);     return $interval->days;   } else if($date2 == $date1) {     return 1;   }   else   {     return 0;   } }

i don't know if want found 2 mistakes :

1) using = , not == compare

2) swapped in comparaison : it's $date2 < $date1

also it's better return 0 failed> try not mix return type in same function, make code easier understand.

this worked me.

edit

in second condition (second line) doing :

if ($datecs >= $datefs) { get_days($datecs,$datece); }

and if function get_days : if ($date2 > $date1)

that means doing 

if ($datecs >= $datefs)    if ($datecs < $datefs)     //do stuff

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