Description:
------------
$query = 'SELECT * FROM emp WHERE empid="$empid"' ;
query is not getting executed if i'm using $empid as variable.
if i'm providing direct empid which i have defined as INT then it is working good.

Reproduce code:
---------------
                $empid=FALSE;
		$ename=FALSE;
		$dept=FALSE;
		$sal=FALSE;
 
		$empid=$_POST["empid"];
		$ename=$_POST["ename"];
		$dept=$_POST["dept"];
		$sal=$_POST["salary"];
		

 If ($empid==TRUE)
 {
	$query = 'SELECT * FROM emp WHERE empid="$empid"' ;	
	$result = mysql_query($query) or die('Query failed: ' . mysql_error());
	//echo "$result";
	while ($line = mysql_fetch_array($result, MYSQL_ASSOC)) 
	{
   echo "\t<tr>\n";
    foreach ($line as $col_value)
	 {
		
        echo "\t\t<td align=center>$col_value</td>\n";
	  
	 }
    echo "\t</tr>\n";
}
echo "</table>\n";

 //Free resultset
mysql_free_result($result);

Expected result:
----------------
full details about that row...

Actual result:
--------------
getting blank page