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L?p trình và Thi?t k? Web 1
? 2007 Khoa C?ng ngh? th?ng tin
Khoa CNTT – ?H.KHTN
i 10
PHP n?ng cao

L?p trình và Thi?t k? Web 1 – Bài 9 : PHP n?ng cao
? 2007 Khoa CNTT - ?HKHTN
N?i dung
? Upload File
? G?i Email
? Cookies
? Sessions

Upload File
? C? ch? Upload File
? Thi?t k? Form cho phép Upload File
? X? l? L?u File upload lên server
? Ki?m tra l?i, ??nh d?ng, kích th??c File upload

Webserver
C? ch? Upload File
Internet
or Intranet
Yêu c?u trang upload.php
Disk
driver
file
Upload.php
? $_FILES[“file"]["name"]
? $_FILES[“file"]["type"]
? $_FILES[“file"]["size"]
? $_FILES[“file"]["tmp_name"]
? $_FILES["file"]["error"]
? move_uploaded_file(tmpName, savedName)
? file_exists(savedName)

Thi?t k? Form cho phép Upload File
? Thi?t l?p thu?c tính Form
– Method : POST
– Enctype: multipart/form-data
--- UploadForm.htm ---
<FORM method="POST" action=“upload.php"
enctype="multipart/form-data">
<input type="FILE" name =“myfile" ><br>
<input type="submit" value=“Submit">
</FORM>

X? l? l?u File lên h? th?ng file system trên Server
? move_uploaded_file(tmp_name, saved_name)
--- Upload.php ---
<?php
move_uploaded_file( $_FILES["file"]["tmp_name"],
"upload/" . $_FILES["file"]["name"]);
echo "Upload: " . $_FILES["file"]["name"] . "<br />";
echo "Type: " . $_FILES["file"]["type"] . "<br />";
echo "Size: " . ($_FILES["file"]["size"] / 1024) . " Kb<br />";
echo “Temp. Stored in: " . $_FILES["file"]["tmp_name"];
?>

Ki?m tra L?i, ??nh d?ng & Kích th??c File
--- Upload.php ---
<?php
if (($_FILES["file"]["type"] == "image/gif")
|| ($_FILES["file"]["type"] == "image/jpeg")
&& ($_FILES["file"]["size"] < 20000))
{
if ($_FILES["file"]["error"] > 0)
{
echo “Error Code: " . $_FILES["file"]["error"] . "<br />";
}
else
{
// Xu ly luu file
}
}
?>

C?u hình ph?n quy?n WRITE cho th? m?c upload
PHP Warning:
move_uploaded_file(upload/14.jpg)
[function.move-uploaded-file]:
failed to open stream: Permission
denied in .

G?i Email
? C? ch? g?i Email
? G?i mail s? d?ng Outlook
? G?i mail s? d?ng Web Mail
– PHP mail() – Non Authentication
– PHP PEAR package – SMTP Authentication

C? ch? g?i Email Mail server
Mail Client
mail(to,subject,message…)
Web Server
Internet
or Intranet
Internet
or Intranet

C? ch? g?i Email

Ví d? C?u hình G?i Email s? d?ng GMAIL

G?i mail s? d?ng c?u hình trong Mail Client - Outlook
? S? d?ng mailto
? Format: mailto:address[?key=setting][&key=setting] …
<A href="mailto:abc@yahoo.com?SUBJECT=Question&BODY=Plz answer">
Key ? ngh?a
SUBJECT Tiêu ?? Email
CC Danh sách ??a ch? Email ng??i nh?n, m?i ??a ch? cách nhau b?ng d?u ch?m ph?y (;).
BCC Danh sách ??a ch? Email ng??i nh?n ???c ?n m?i ??a ch? cách nhau b?ng d?u ch?m ph?y (;).
BODY N?i dung Email.

G?i mail s? d?ng PHP mail() - Non Authentication
? mail(to,subject,message,headers,parameters)
Key Specifies
TO ??a chì email ng??i nh?n
SUBJECT Tiêu ?? Email (KH?NG ???c ch?a k? t? xu?ng dòng)
MESSAGE N?i dung Email
HEADERS
Th?ng tin thêm (vd: FROM, BCC, CC,…) Các th?ng tin này nên ph?n cách nhau
b?ng k? t? xu?ng dòng (rn)
PARAMETERS Tham s? c?u hình cho ?ng d?ng g?i mail

C?u hình m?c ??nh c?a PHP mail() – Non Authentication
? C?u hình m?c ??nh ???c ??nh ngh?a trong file php.ini
Default ? ngh?a
SMTP localhost DSN ho?c IP Address c?a SMTP Server
smtp_port 25 Port c?a SMTP
sendmail_from NULL ??a ch? ng??i g?i
sendmail_path NULL ???ng d?n ??n ?ng d?ng g?i mail
(UNIX)

Ví d?
<?php
// ??nh ngh?a email ng??i nh?n
$to = ?noname@yahoo.com';
// tiêu ??
$subject = 'Test email';
// n?i dung email
$message = "Hello World!nnThis is my first mail.";
// ??nh ngh?a email ng??i g?i và email tr? l?i
$headers = "From: mymail@yahoo.comrnReply-To: replymail@yahoo.com";
// g?i email
$mail_sent = @mail( $to, $subject, $message, $headers );
// ki?m tra g?i thành c?ng và th?ng báo
echo $mail_sent ? "Mail sent" : "Mail failed";
?>

G?i mail s? d?ng PHP PEAR package – SMTP Authentication
1. S? d?ng PEAR package Mail.php
– require_once(?Mail.php?);
2. Kh?i t?o th? hi?n ?? g?i mail s? d?ng Mail::factory()
– $smtp = Mail::factory(?smtp?, $params);
? $params[“host”] = “hostname”;
? $params[“auth”] = true;
? $params[“username”] = “smtp_username”;
? $params[“password”] = “smtp_password”;
3. G?i mail s? d?ng hàm send()
– $mail = $smtp->send($to, $headers, $message)
? $headers['From'] = 'from@example.com';
? $headers['To'] = $to;
? $headers['Subject'] = 'Test message';
? $headers['Cc'] = 'cc@example.com';
? $headers['Reply-To'] = 'from@example.com';
4. Ki?m tra l?i g?i mail
– if (PEAR::isError($mail))
echo($mail->getMessage());

Ví d?
<?php
require_once "Mail.php";
$host = “smtp.gmail.com";
$username = “ttbhanh@gmail.com";
$password = "smtp_password";
$to = “noname@yahoo.com”;
$headers = array ('From' => ?ttbhanh@gmail.com?,
'Subject' => ?Test send mail?);
$smtp = Mail::factory('smtp', array ('host' => $host,
'auth' => true,
'username' => $username,
'password' => $password));
$mail = $smtp->send($to, $headers, ?this is my message?);
if (PEAR::isError($mail))
echo($mail->getMessage());
else
echo("<p>Message successfully sent!</p>");
?>

Cookies
? Là 1 t?p tin ???c server l?u xu?ng máy c?a client
? M?i l?n client g?i request 1 trang web, ??ng th?i s? g?i file
cookie này lên server
? Các ?i?u khi?n x? l? th?ng tin (l?u, l?y) do server th?c hi?n
? Th??ng ???c s? d?ng ?? l?u th?ng tin cá nh?n c?a client
Webserver
cookie
setcookie
$_COOKIE
Client

S? d?ng Cookies
? L?nh ghi cookie
– setcookie(name, value, expire, path, domain);
– setrawcookie(name, value, expire, path, domain);
? Name: tên cookie
? Value: giá tr? cookie
? Expire: ngày/kho?ng th?i gian h?t h?n h?t h?n
? Path : ???ng d?n mà cookie ???c g?i ?i
? Domain : xác ??nh tên mi?n mà cookie ???c g?i ?i
? B?t bu?c ph?i xu?t hi?n tr??c th? <html>
? L?y giá tr? cookie
– echo $_COOKIE[“cookieName"];
? Xóa cookie
– setcookie(“cookieName", "", time()-3600);

Ví d? Cookies
? L?u th?ng tin ??ng nh?p
cookie
setcookie
$_COOKIE[fieldName]
Client
L?u username & password
Webserver

Session
? Là th?ng tin v? client ???c server l?u trên máy c?a server
? S? d?ng cookie l?u ??nh danh duy nh?t cho t?ng client
? M?c ?ích l?u bi?n d? li?u dùng chung cho nhi?u trang
trong 1 phiên làm vi?c c?a client
Webserver
Cookie: PHPSESSID
session_start
$_SESSION[sessname]
Client

S? d?ng Session
? Kh?i ??ng Session
– session_start();
? B?t bu?c ph?i xu?t hi?n tr??c th? <html>
? Ghi & ??c giá tr? Session
– $_SESSION[“sessionName”] = value
– $_SESSION[“sessionName”][ ] = array(…)
– if (isset($_SESSION[“sessionName"])
echo $_SESSION[“sessionName"];
? H?y Session
– session_destroy();

C?u hình Session
? C?u hình trong php.ini
? ini_set(‘parameter’, value);
– G?i tr??c hàm session_start();
Parameter Default
session.auto_start 0 Kh?ng t? ??ng
session.cookie_lifetime 0 T?n t?i cho ??n
khi ?óng browser
session.name PHPSESSID Tên bi?n cookie
…

Ví d? Session
? ??m s? l?n duy?t 1 trang web c?a 1 user
<?php
session_start( );
if (isset($_SESSION["count"]))
$_SESSION["count"] = $_SESSION["count"] + 1;
else
$_SESSION["count"] = 1;
print "You've looked at this page " . $_SESSION['count'] .
' times.';
?>

?ng d?ng Session
? Làm th? nào ?? ng?n kh?ng cho ng??i dùng truy c?p
vào các trang web n?u ch?a ??ng nh?p?
? ? t??ng
– Dùng các bi?n Session ?? l?u tr?ng thái ??ng nh?p c?a ng??i
dùng:
$_SESSION[“IsLogin”] = 0/1 : L?u tr?ng thái ??ng nh?p
$_SESSION[ “Username”] : L?u Tên ??ng nh?p
$_SESSION[ “Authentication”] : L?u Lo?i quy?n ??ng
nh?p
…

Làm th? nào ?? ng?n kh?ng cho ng??i dùng truy c?p
1. T?o trang login.htm yêu c?u ng??i dùng ??ng nh?p.
2. T?o trang validateuser.php là trang x? lí th?ng tin ??ng nh?p t? trang
login
– K?t n?i v?i CSDL, ki?m tra xem th?ng tin ??ng nh?p có ?úng hay kh?ng.
– N?u kh?ng ?úng thì cho redirect ??n trang login.htm.
– Còn n?u ??NG thì dùng m?t bi?n Session ?? l?u tr?ng thái login thành
c?ng l?i.
? Ví d? $_SESSION["IsLogin“] = 1.
? L?u ? là ph?i ??t giá tr? m?c ??nh cho bi?n này là 0 khi kh?i t?o m?t
Session.
3. T?o trang logout.php là trang x? l? khi ng??i dùng logout
? Reset tr?ng thái login là ch?a ??ng nh?p

Làm th? nào ?? ng?n kh?ng cho ng??i dùng truy c?p
4. Trong t?t c? các trang mu?n b?o m?t, ph?i thêm ?o?n m?
sau ?? ki?m tra ng??i dùng ?? login hay ch?a, n?u ch?a
thì redirect l?i trang login.htm
<?php
session_start();
if ($_SESSION["IsLogin“] != 1)
header(“Location: login.htm“);
?>

So sánh
Clients
Web servers
Database/File
Session (client1)
Session (client2)cookies
cookies
Th?ng tin chia s? V? trí
l?u tr?
Th?i gian
t?n t?i
S? client S? trang web
s? d?ng
Database/File Server Dài N N
Session Server Ng?n 1 N
Cookies Client Dài 1 N
Internet
or Intranet

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