Bài giảng Lập trình web Chương 5 Lập trình PHP

yet another line of comment */echo"This is yet another test"; print "Hello World"; print"Hello World"; ?>... Phép toán 29 Phép toán... code to be executed if expression = label1;echo "Nu

Thanh Ngh

dtnghi@cit.ctu.edu.vn

C n Th 24-11-2005

Khoa Công Ngh Thông Tin

PHP k t h p v i forms Cookies, SSI (Server side includes), Date PHP-MySQL

Gi i thi u v PHP

Bi n, ki u d li u, phép toán

L nh i u khi n Hàm

PHP k t h p v i forms Cookies, SSI (Server side includes), Date PHP-MySQL

S d ng ph n m r ng tên file : php, phtml PHP scripts s tr v k t qu cho trình duy t m t plain HTML

Gi i thi u v PHP

5

MySQL là gì ?

H qu n tr c s d li u Dùng cho các ng d ng v a và nh

Tư ng thích v i h u h t các web server (Apache, IIS, etc)

D h c và phát tri n nhanh các ng d ng trên Web

Gi i thi u v PHP

Bi n, ki u d li u, phép toán

L nh i u khi n Hàm

PHP k t h p v i forms Cookies, SSI (Server side includes), Date PHP-MySQL

7

Cú pháp PHP

8

Cú pháp

PHP scripts ch a text, th HTML, script

Ví d : in ra màn hình chu i “Hello World”

yet another line of comment */

echo("This is yet another test");

print "Hello World";

print("Hello World");

?>

Tên bi n b!t u b%ng m t ký t& ch cái ho"c _

Phân bi t gi a ký t& thư'ng và hoa

echo "$var, $Var"; // outputs "Bob, Joe"

$4site = 'not yet'; // invalid; starts with a number

$_4site = 'not yet'; // valid; starts with an underscore

$täyte = 'mansikka'; // valid; 'ä' is (Extended) ASCII 228.

?>

$foo = 'Bob'; // Assign the value 'Bob' to $foo

$bar = &$foo; // Reference $foo via $bar.

$bar = "My name is $bar"; // Alter $bar

echo $foo; // My name is Bob

$foo = array(1, 2, 3, 4, 5);

for($i = 0; $i < 5; $i++) echo $foo[$i] "<br>";

?>

Bi n

15

Bi n có s(n trong PHP

$GLOBALS : t#t c các bi n trong ph m vi toàn c c c)a script

$_SERVER : t*p h p bi n môi trư'ng c)a Web server

$_GET, $_POST : bi n ư c cung c#p các chu i query URL cho script

$_COOKIE : bi n cung c#p HTTP_cookies cho script

$_FILES : bi n cung c#p HTTP POST file uploads cho script

$_ENV : bi n cung c#p môi trư'ng cho script

$_REQUEST : cung c#p các $_GET, $_POST, $_COOKIE

$b = $a + $b;

} Sum();

echo $b;

?>

echo “<br> out Test a = “ $a;

echo “ in Test a = “ $a;

$a++;

} Test(); // 10 Test(); // 11

?>

Ki u d li u ph c h p

m ng

i tư ng

Ki u gi Etc.

$a = 0123; // octal number (equivalent to 83 decimal)

$a = 0x1A; // hexadecimal number (equivalent to 26 decimal)

$b = 1.234;

$c = 1.2e3;

$d = 7E-10;

?>

}// this is not necessary

if ($show_separators == TRUE) {echo "<hr>\n";

}// because you can simply type

if ($show_separators) {echo "<hr>\n";

echo "He drank some {$beer}s"; // works

$str = 'This is a test.';

$third = $str{2}; // Get the third character of a string

$str = "This is still a test.";

$last = $str{strlen($str)-1}; // Get the last character of a string

$str = 'Look at the sea';

$str{strlen($str)-1} = 'e'; // Modify the last character of a string

?>

Ki u

25

Ki u d li u

m ngarray( [key =>] value,

)// key may be an integer or string// value may be any value

Ví d :

<?php

$arr = array("foo" => "bar", 12 => 1);

echo $arr["foo"]; // barecho $arr[12]; // 1

$a = array(5 => 43, 32, 56, "b" => 12);

// this array

$a_n = array(5 => 43, 6 => 32, 7 => 56, "b" => 12);

?>

$arr[] = 56; // This is the same as $arr[13] = 56;

$arr["x"] = 42; // This adds a new element to the array with key "x"

unset($arr[5]); // This removes the element from the arrayunset($arr); // This deletes the whole array

Phép toán

29

Phép toán

Phép toán

31

Phép toán

32

Gi i thi u v PHP

Bi n, ki u d li u, phép toán

L nh i u khi n

Hàm PHP k t h p v i forms Cookies, SSI (Server side includes), Date PHP-MySQL

else code to be executed if condition is false;

Ví d :

<?php

$d=date("D");

if ($d=="Fri") echo "Have a nice weekend!";

else echo "Have a nice day!";

code to be executed if expression = label1;

echo "Number 1"; break;

Ví d :

<?php

$i=1;

while($i<=5) { echo "The number is " $i "<br />";

echo "Hello World!<br />";

$arr=array("one", "two", "three");

foreach ($arr as $value) {

echo "Value: " $value "<br />";

}

?>

Hàm nh ngh+a s(n trong PHP

echo "Example function.\n";

?>

return "Making a cup of $type.<br>";

} echo makecoffee();

$string = 'and something extra.';

return $num * $num;

} echo square(4); // outputs '16'.

return array (0, 1, 2);

} list ($zero, $one, $two) = small_numbers();

?>

PHP k t h p v i forms

Cookies, SSI (Server side includes), Date PHP-MySQL

52

<form action="welcome.php" method="POST">

Enter your name: <input type="text" name="name">

Enter your age: <input type="text" name="age">

<input type="submit" value="welcome">

Welcome <?php echo $_POST["name"]; ?>.<br>

You are <?php echo $_POST["age"]; ?> years old!

</body>

</html>

Gi i thi u v PHP

Bi n, ki u d li u, phép toán

L nh i u khi n Hàm

else echo "You are not logged in!<br />";

//Prints something like: Monday 15th of January 2003 05:51:38 AMecho date("l dS of F Y h:i:s A");

//Prints something like: Monday the 15thecho date("l \\t\h\e jS");

?>

Gi i thi u v PHP

Bi n, ki u d li u, phép toán

L nh i u khi n Hàm

PHP k t h p v i forms Cookies, SSI (Server side includes), Date

PHP-MySQL

63

MySQL

Download : www.mysql.com , cài "t

Có th cài thêm giao di n qu n tr Ho"c s d ng trình mysql (client)mysql -u root -p

Enter password: ******

Welcome to the MySQL monitor Commands end with ; or \g

Your MySQL connection id is 4 to server version: 5.0.15-ntType 'help;' or '\h' for help Type '\c' to clear the buffer

mysql>

MySQL

64

L nh c b n MySQL

T o xóa c s d li u : create (drop) database dbname

T o xóa ngư'i dùng : create (drop) user uname

T o xóa quy n truy c*p : grant (revoke) …

T o xóa b ng : create (drop) table tname Chèn m,u tin : insert into tname values (…) Xóa m,u tin : delete … from tname where … C*p nh*t : update tname set colname = value …

65

MySQL

Database changedmysql> CREATE TABLE Person-> (

-> lastname varchar(30),-> firstname varchar(10),-> address varchar(30),-> age int

Chèn các m,u tin vào b ng Person

mysql> insert into Person values ('Thanh-Nghi', 'Do', '84/40, CMT8',31);

mysql> insert into Person values ('Nguyen-Khang', 'Pham', '43/20, Mau Than',27);mysql> insert into Person values ('Nguyen-Binh', 'Le', '12, Nguyen Thong',18);

mysql> insert into Person values ('Trung-Tin', 'Nguyen', '31, Ngo Quyen',12);

mysql> insert into Person values ('Binh-Minh', 'Bui', 'C8, Truong Dinh',22);

mysql>

| Nguyen-Khang | Pham | 43/20, Mau Than | 27 |

$conn = mysql_connect("127.0.0.1", "nghi", "nghi")

or die("Could not connect: " mysql_error());

$db = mysql_select_db("mydb",$conn)

or die("Could not select database");

$result = mysql_query("SELECT * FROM Person",$conn);

echo "<TABLE BORDER=1>";

echo "<TR><TH> LASTNAME </TH> <TH> FIRSTNAME </TH>

<TH> ADDRESS </TH> <TH> AGE </TH> </TR>";