check 8-digits-date

gistfile1.php

<?php
/**
 * check 8-digits-date is correct
 * 
 * @param string $date
 * @return boolean
 */
protected function checkDate($date) 
{
	$len = strlen($date);
	$intdate = intval($date);
	
	if ($len === 8 &&  $intdate !== 0) {
		$d = str_split($date, 2);
		
		$year = $d[0] . $d[1];  
		$month = $d[2];
		$day = $d[3];
		
		if (checkdate($month, $day, $year)) {		
			return true;
		} else {
			return false;
		}
	} else {
		return false;
	}
}