Validate date format in php

by 
function _date_is_valid($str) {
    if (substr_count($str, "https://stackoverflow.com/") == 2) {
        list($d, $m, $y) = explode("https://stackoverflow.com/", $str);
        return checkdate($m, $d, sprintf('%04u', $y));
    }

    return false;
}

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