Get Difference Between 2 Dates Using PHP

...
public static function toTimestamp($date){
    $arrayDate=self::toArray($date);
    return mktime($arrayDate['hour'],$arrayDate['minute'],$arrayDate['second'],$arrayDate['month'],$arrayDate['day'],$arrayDate['year']);
}
 
public static function dateDiff($date1,$date2,$unit='HOUR'){
    $date1=self::toTimestamp($date1);
    $date2=self::toTimestamp($date2);
 
    $secs=$date1-$date2;
 
    switch(strtoupper($unit)){
        case 'WEEK':return $secs/60/60/24/7; break;
        case 'DAY':return $secs/60/60/24; break;
        case 'HOUR':return $secs/60/60; break;
        case 'MINUTE':return $secs/60; break;
        case 'SECOND':return $secs; break;
        default:return $secs/60/60; break;
    }
}
...

DateFormat::dateDiff($current_tr->requisition_dateTo,$current_tr->requisition_dateFrom,"DAY"));