[Solved] If condition bug? how to solve this?

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PHP

Hi,
Actually i am using a simple if condition but getting some error
The code

$q="select * from cutomer_details";
$val=mysql_query($q,$con) or die("Mysql error".mysql_error());
$num= mysql_num_rows($val);
$i=0;
while($i<$num)
{
$f1=mysql_result($val,$i,"birth_date");
//echo $f1."<br/>";
//$b_date=intval(substr($f1, -5,2));
$b_date=substr($f1, -5,2);
//echo "<br/>".$b_date."<br/>";
if($b_date==01)
{
$bjan++;
//$bjan=intval($bjan);
//echo $bjan;
}
else if($b_date==02)
{
$bfeb ++;
//echo $bfeb;
}
else if($b_date==03)
{
$bmarch++;
//echo $bmarch;
}
else if($b_date==04)
{
$bapril ++;
//echo $bapril;
}
else if($b_date==05)
{
$bmay ++;
//echo $bmay;
}
else if($b_date==06)
{
$bjune ++;
//echo $bjune;
}
else if($b_date==07)
{
$bjuly ++;
//echo $bjuly;
}
else if($b_date==08)// loop not checking this
{
$baugust ++;
//echo $baugust;
}
else if($b_date==09)// loop not checking this
{
$bseptember ++;
//echo $bseptember;
}
else if($b_date==10)
{
$boctober ++;
//echo $boctober;
}
else if($b_date==11)
{
$bnovember ++;
//echo $bnovember;
}
else if($b_date==12)
{
$bdecember ++;
//echo $bdecember;
}
//else if($b_date==01)
else
{
echo $b_date."<br>"; // but here i am getting 08 and 09.

}


$i++;
}

Can any one suggest what is wrong in my code.

Solved
By just adding "".
Donot know why all other were working expect 08 and 09.

Thanks