get date from specific keys in associative array

[russthebarber]

I have an associative array with dates and prices:

$priceArr=array("2012-9-13"=>"34.00", "2012-9-14"=>"35.00", "2012-9-20"=>"36.00", "2012-10-21"=>"37.00", "2012-10-28"=>"38.00", "2012-10-29"=>"38.00");

I'm looking for the best solution. I need to loop through the array and explode just the keys that have a 9 in the middle (i.e. are in September). Then I just need the date value in a new array....which should look like this when finished:

$dateArr=array("13", "14", "20");

The exploding and pushing items into the second array I can do, it's just dealing with the key from the associative array that's new and confusing territory for me.

 

[trq]

Lost me. Have you got any code?

[russthebarber]

I'll try and explain it another way.  If you look at the keys (dates) in $priceArr, you'll see that there are three dates in September....the 13th, 14h and 20th. This information is in $dateArr.  The question is if $dateArr didn't exist how would I create it in php from $priceArr?

[trq]

A better question is, how is $priceArr created?

[salathe]

You can loop over the array's keys by using something like foreach(array_keys($priceArr) as $date), then inside the loop do whatever checking you need and build the date array. For example:

 

$dateArr = array();
foreach (array_keys($priceArr) as $date) {
    $datetime = new DateTime($date);
    if ($datetime->format('F') == 'September') {
        $dateArr[] = $datetime->format('j');
    }
}

 

 

[russthebarber]

Brilliant. Thanks salathe.