如何将日期存储在多维关联数组上？

Question

How can I store dates on a multi-dimensional associative array? I can't explain further my problem, but what if I have an array that contains different dates. For example:

<?php 
$dates = array("2015-06-01","2015-06-07","2015-07-08","2015-08-01", "2015-08-21","2015-08-26");
?>

I want to store the array above into multi dimensional associative array, according to their month, so therefore it would be like this..

<?php
array = array(
"June" => array("2015-06-01","2015-06-07"),
"July"=> array("2015-07-08"),
"August" => array("2015-08-01","2015-08-21","2015-08-26")
);

?>

But in my case, the dates are from the database compare to the example above that are defined dates, how can I group that following dates according to their month and store in an associative array named according to their month and the content is the second dimensional array that contains the date grouped?

Thanks!

My code above are just example: This is my solution but it's not working good! -_-

<?php 
include($_SERVER["DOCUMENT_ROOT"] . "/empc/library/functions.php");
$previousmonth = "";
$a = getDistinctDates(); // Function that get dates, nevermind of this.
$data = array();
foreach ($a as $b){ 
    echo $b["date_modified"] . "<br>";
    $datemonth = date("F",strtotime($b["date_modified"]));
    echo $datemonth . "<br>";

    if ($datemonth != $previousmonth){
        array_push($data,
            array(
                $datemonth => $b["date_modified"]
            )
        );
    } else {
        array_push($data[$datemonth][],$b["date_modified"]);
    }

    echo $b["balance_after_approval"] . "<br>";
    echo "<br>";
    $previousmonth = $datemonth;
}
?>

Answer 1

your over thinking this, just use the month as the array key:

<?php 
$dates = array("2015-06-01","2015-06-07","2015-07-08","2015-08-01", "2015-08-21","2015-08-26");
$out=array();
foreach ($dates as $b){ 
    $datemonth = date("F",strtotime($b));
    $out[$datemonth][]=$b;
}
  print_r($out);

?>

demo: http://codepad.viper-7.com/3Gh9s7