Count dates inside an array PHP

Question

I have this Array :

Array (
[0] => Array ( [x] => 2016-04-19 ) 
[1] => Array ( [x] => 2016-05-25 ) 
[2] => Array ( [x] => 2016-05-26 ) 
[3] =&g         


        

Answer 1

Using array_map you can convert the dates to strings, then you can use array_count_values:

$theArray = array(array('x' => new DateTime('2016-04-19')), 
    array('x' => new DateTime('2016-04-19')),
    array('x' => new DateTime('2016-04-19')),
    array('x' => new DateTime('2016-05-19')));

function formatDate($d) {
    return $d['x']->format('Y-m-d');
}
$results = array_map("formatDate", $theArray);

print_r(array_count_values($results));

.

Array (
    [2016-04-19] => 3
    [2016-05-19] => 1 
)

Then you can use this to determine the duplicates.

(This would also be useful if the dates contained time elements that you wanted to ignore.)