This will display every Friday of the current month, use the array $fridays for the unix time. Let me know if you have any questions.
$now = time();
$nowYear = date('Y', $now);
$nowMonth = date('n', $now);
$nowDay = date('j', $now);
$uFirstDay = mktime(0,0,0,$nowMonth,1,$nowYear);
$uLastDay = mktime(0,0,0,$nowMonth+1, 0, $nowYear);
$firstDay = date('D', $uFirstDay);
$fridays = array();
$fridaysCount = 0;
$day = $uFirstDay;
while($day <= $uLastDay){
$weekday = date('D', $day);
if($weekday == "Fri"){
$fridays[$fridaysCount] = $day;
echo date('D, M j, Y', $day) . "<br>";
$fridaysCount++;
}
$day = $day + (60*60*24);
}
echo "<br><br>There are $fridaysCount Fridays this month<br>$fridays[0],$fridays[1],$fridays[2],$fridays[3]";