code igniter . i have issue to show upcoming birthday of month(like July) custom - codeigniter

Question

I am beginner in development i have issue to show upcoming birthday of month(like July) guide me to please fix this problem here is code. here is code to show upcoming birthday.
<h3 class="panel-title"><?php echo 'Upcomming Birthday' ?> - <?php echo date("F"); ?></h3>
<ul class="leave_apps">
<?php
$m = date("m"); // Month value
$y = date("Y"); // Year value
$num = cal_days_in_month(CAL_gregorian , $m, $y);
?>
<?php
for ($i = 0; $i < count($employee); $i++) :
$mem_bod_explode = explode("-", $employee[$i]->date_of_birth);
$m_bday = mktime(0, 0, 0, $mem_bod_explode[1], $mem_bod_explode[2], $y);
$start_date = date('Y-m', $m_bday) . '-01';
$end_date = date('Y-m', $m_bday) . '-' . $num;
if (date('Y-m-d') == date('Y-m-d', $m_bday)) {
$present_bday[] = $employee[$i];
$date = date('Y-m-d', $m_bday);
$pdate[] = date('d M Y', strtotime($date));
} else if (date('Y-m-d', $m_bday) > $start_date && date('Y-m-d', $m_bday) <= $end_date) {
$future_bday[] = $employee[$i];
$date = date('Y-m-d', $m_bday);
$fdate[] = date('d M Y', strtotime($date));
}
?>
<?php endfor; ?>
<?php if (!empty($present_bday)):foreach ($present_bday as $key => $v_bday): ?>
<li>
<a href="<?php echo base_url() ?>admin/employee/view_employee/<?php echo $v_bday->employee_id ?>">
<h5>
<div class="pull-left">
<img class="img-circle" src="<?php echo base_url() . $v_bday->photo ?>">
</div>
<span><?php echo $v_bday->first_name . ' ' . $v_bday->last_name ?></span>
<small class="apps_category" style="color:red">(Today)</small>
<p class="leave_para"><?php echo $pdate[$key]; ?></p>
</li>
<?php endforeach; ?>
<?php endif; ?>