No Need of DATE_FORMAT() function.
Example-1: If 00 used in day. Then, output will be June, 2017
<?php
$date = '2017-07-00';
echo date('F, Y', strtotime($date)); //June, 2017
?>
Example-2: If 01 or valid day used in day. Then, output will be July, 2017
<?php
$date = '2017-07-01';
echo date('F, Y', strtotime($date)); //July, 2017
?>
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