日期范围为几个月的PHP

Question

I'm trying to set my output to “Date not confirmed” if the date from MySQL = 2013-12-25 & $daydiff = "anything" and output "Not available" if the MySQL date = "NULL" & and $daydiff = "anything"

My code below doesn't seem to work, any suggestions or alternatives?

$ArrivalDate == $variants_data['ArrivalDate'];

$daydiff=floor((abs(strtotime(date("Y-m-d")) - strtotime($ArrivalDate))/(60*60*24)));


if ( $daydiff == '%wildcard%' && $ArrivalDate == '2013-12-25') {
    $ETA ='Date Not Confirmed';
} 

elseif ( $daydiff == '%wildcard%' && $ArrivalDate == 'NULL') {
    $ETA ='Not available';
}

elseif ( $daydiff > 30 && $daydiff < 60 ) { // anything between 31 and 59 days is 1 month
    $ETA ='1 Month';
}

elseif ( $daydiff > 60 &&  $daydiff < 90  )  { // anything between 61 and 89 days is 2 months
    $ETA ='2 Months';
}

else
{
    $ETA ='';
}

Answer 1

Well you are assign variables in your if clauses... Single "=" is assigning. I assume you want to check so you need "==" :)

if (!empty($daydiff) &&  $ArrivalDate == '2013-12-25') {
   $ETA ='Date Not Confirmed';
} 

elseif (is_null($ArrivalDate) || $ArrivalDate == 'NULL') {
   $ETA ='Not available';
}

Answer 2

What is your output? Always "Date Not Confirmed"?

I would guess so, because "=" does not compare strings:

if ( $daydiff = '%wildcard%' && $ArrivalDate = '2013-12-25') {
    $ETA ='Date Not Confirmed';
} 

would be

if ( $daydiff == '%wildcard%' && $ArrivalDate == '2013-12-25') {
    $ETA ='Date Not Confirmed';
} 

But then, '%wildcard%' is not something, PHP replaces by 'anything'. So, what is your exact error? If it does not matter, what $daydiff is, just leave it out of your condition.