PHP - Remove an array element in a loop? Remover um elemento da array a cada ciclo do loop.

gistfile1.txt

$arr1v=Array
(
    "2016-04-11 17:16:59"=> "2016-04-11 17:16:59",
    "2016-04-14 16:47:18"=> "2016-04-14 16:47:18",
    "2016-04-14 15:39:30" => "2016-04-14 15:39:30",
    "2016-04-12 15:35:46" => "2016-04-12 15:35:46",
    '2016-04-14 15:31:43'=> "2016-04-14 15:31:43",
    '2016-04-14 15:27:10'=> "2016-04-14 15:27:10",
    '2016-04-14 14:59:45' => '2016-04-14 14:59:45',
    '2016-04-15 13:41:22'=> '2016-04-15 13:41:22',
    '2016-04-14 13:18:07'=> '2016-04-14 13:18:07',
    '2016-04-14 13:15:06'=> '2016-04-14 13:15:06',
    '2016-04-18 12:42:59' => '2016-04-18 12:42:59',
    '2016-04-14 12:06:04' => '2016-04-14 12:06:04',
    '2016-04-14 12:02:57' => '2016-04-14 12:02:57',
    '2016-04-16 11:13:07'=> '2016-04-16 11:13:07',
    '2016-04-17 09:49:27' => '2016-04-17 09:49:27'
);

foreach ($arr1v as $key => $value) {
        //1-Do some stuff with $arr1v[$key]; Fazer alguma coisa desejada com $arr1v[$key]
        //2-Delete from array using unset($arr1v[$key]); Deletar o elemento $arr1v[$key] usando unset($arr1v[$key])
        //3-Test the result with echo e print_r. Fazer o teste com echo e print_r
        echo "<pre>";
           print_r( $arr1v);
        echo "</pre>"; 
        unset($arr1v[$key]);
        
}
//Array should be empty. Array devera estar vazia        
echo "<pre>";
    print_r( $arr1v);
echo "</pre>";