How to convert month name to month number - php

Question

i want to convert month name to month number. By using this code, it is only show a result for december, the other month didnt work. But it is work if i change the year. For example, i choose November and 2015, the result is December and 2015. and if i choose November and 2014, the result is December and 2014.
The value in the database is 2015-09-28. i think there is a mistake on how i convert month name to month number. Can someone help me to fix my code.
This is my code :
VIEW
<?php echo form_open("announcement/announcement_result");?>
<?php echo form_dropdown('m', $m, set_value('m'), 'id="m"'); ?>
<?php echo form_dropdown('q', $q, set_value('q'), 'id="q"'); ?>
<?php echo form_submit('search', 'SEARCH', 'class="button expand"'); ?>
<?php echo form_close(); ?>
CONTROLLER
function announcement_list()
{
$data['q'] = array(
'' => ' Select Year',);
for ($i = 0; $i < 10; $i++)
{
$date = date('Y') - $i;
$data['q'][$date] = $date;
}
$m = '';
$data['m'] = $m;
$data['m'] = array(
'' => 'Select Month',
);
for ($m = 1; $m <= 12; $m++) {
$month = date("F", mktime(0, 0, 0, $m));
$data['m'][$month] = $month;
}
if ($m='December')
{
$m='12';
}
else if($m='November')
{
$m='11';
}
else if ($m='October')
{
$m='10';
}
else if ($m='September')
{
$m='9';
}
else if ($m='August')
{
$m='8';
}
else if ($m='July')
{
$m='7';
}
else if ($m='June')
{
$m='6';
}
else if ($m='May')
{
$m='5';
}
else if ($m='April')
{
$m='4';
}
else if ($m='March')
{
$m='3';
}
else if ($m='February')
{
$m='2';
}
else if ($m='January')
{
$m='1';
}
$data['results'] = $this->news_model->get_announcement_list($config['per_page'], $page);
}
MODEL
function get_results($m, $q, $limit=6, $offset=0)
{
$sql = "SELECT *
FROM ArkibBerita
WHERE code='PENGUMUMAN' AND Enable = 'Y' AND Lang ='EN' AND YEAR(BeritaDate)='{$q}' AND MONTH(BeritaDate)='{$m}'
ORDER BY position ASC
OFFSET {$offset} ROWS
FETCH NEXT {$limit} ROWS ONlY";
$query = $this->db->query($sql);
return $query->result();
}

Answer 1

What about:
echo date('m', strtotime('january'));
Output:
01
If you don't want the leading zero use n or see the manual for other usages; http://php.net/manual/en/function.date.php.
In your code you aren't comparing the date, you are setting it.
if ($m='December')
Should be
if ($m=='December')
One equals sets. Two equals compares. Three equals compares and requires the same variable type. http://php.net/manual/en/language.operators.comparison.php
So on every iteration your $m is going to be 12 because the $m always sets to the string and that is the first condition it hits. If you inverted your order it would be set to 1.
You also should look into using prepared statements for your SQL queries. http://php.net/manual/en/security.database.sql-injection.php