PHP - sort array by month and year

Question

This is my array:

$ar = array( 
 'Jan-2016' => 1,
 'Feb-2016' => 2,
 'Mar-2016' => 3,  
 'Apr-2016' => 4,
 'May-2016' => 4,
 'Jun-2016' => 4,
 'Jul-2016' => 4,
 'Aug-2016' => 4,
 'Sep-2016' => 4,
 'Oct-2016' => 4,
 'Nov-2016' => 4,
 'Dec-2016' => 4,
 'Jan-2015' => 1,
 'Mar-2015' => 1);

I want to sort this array by month & year. I've tried below code:

ksort($ar);

But i can't get result as i expected.

I need result as below array:

$ar = array(
 'Jan-2015' => 1,
 'Mar-2015' => 1,
 'Jan-2016' => 1,
 'Feb-2016' => 2,
 'Mar-2016' => 3,  
 'Apr-2016' => 4,
 'May-2016' => 4,
 'Jun-2016' => 4,
 'Jul-2016' => 4,
 'Aug-2016' => 4,
 'Sep-2016' => 4,
 'Oct-2016' => 4,
 'Nov-2016' => 4,
 'Dec-2016' => 4);

php.net/manual/en/function.uksort.php - Sort an array by keys using a user-defined comparison function. — PaulRoth
– PaulRoth, Commented Jan 7, 2016 at 9:29

ôkio · Accepted Answer · 2016-01-07 09:42:06Z

10

uksort is the right function to use :

uksort($ar, function($a1, $a2) {
        $time1 = strtotime($a1);
        $time2 = strtotime($a2);

        return $time1 - $time2;
    });

print_r($ar);

edited Jan 7, 2016 at 9:42

answered Jan 7, 2016 at 9:37

ôkio

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2 Comments

u_mulder Over a year ago

return $time1 - $time2 is much simpler.

ôkio Over a year ago

@u_mulder well doesn't change much, but you're right

PaulRoth · Accepted Answer · 2016-01-07 09:56:20Z

0

Supplement: Sort Order

$sortOrder = true;  // ASC
$sortOrder = false; // DESC

uksort($array, function($a, $b) use($sortOrder) {
    $timeA = strtotime($a);
    $timeB = strtotime($b);

    return $sortOrder ? ($timeA - $timeB) : ($timeB - $timeA);
});

answered Jan 7, 2016 at 9:56

PaulRoth

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