ช่วยดูโค้ดนี้ทีครับ โค้ดส่งเมล์ mysql_connect($host,$user,$passwd) or die("ไม่สามารติดต่อฐานข้อมูลได้");

$sql = "select * from userinfo where id=$id";
$dbquery = mysql_db_query($dbname, $sql);
$array = mysql_fetch_array($dbquery);

<?php 
			$admin_username2=$_POST[admin_username2];
			
			if ($admin_username2==""){
			echo "<h3>ERROR : Please input your Username</h3>"; exit();
			}
			include "connect.php";
			 $sql = "select * from admin WHERE admin_username='$admin_username2'";
           $result = mysql_db_query($dbname,$sql);	
			$record = mysql_fetch_array($result); 
        	$num=mysql_num_rows($result); 
			
	 	if ($num<=0){
		echo "<h3>ERROR : This user does not exist in the system.</h3>";
		} else {
			$to=$record[admin_email];
			$password=$record[admin_password];
			$subject = "Inform the membership password.";
			$message = "Username : $user_forget </br>Password : $admin_password";
			$headers = "From IMSDC";
							if (@mail($to, $subject, $message, $header)) {
								echo "<h3>Password mainly sent successfully.</h3>";
							}else{ echo "<h3>Cannot  sent password to email </h3>";}
			}
   			mysql_close();    
			?>