Gio trnh PHP Cn BanGiang Vin: Bi Quc Huy Trang
1/68www.qhonline.info Trung Tm Do To Cng Ngh Mng Vit Chuyn Ti Liu
Luu Hnh Ni B www.qhonline.info GIO TRNH PHP & MYSQL
Bin Son:GV. Bi Quc Huy Gio trnh PHP Cn BanGiang Vin: Bi Quc Huy
Trang 2/68www.qhonline.info Loi Ni Du Quyn gio trnh ny duoc tng hop
tu nhung ti liu v kinh nghim thuc tin qua nhiu nm giang day cua
giang vin, v duoc soan thao cho ph hop voi ni dung mn hoc. Khc voi
gio trnh mang tnh thuong mai, cc tu ngu, cch din giai mang xu th
thut ngu, gio trnh duoc xy dung trn hnh thuc d doc, d hiu v gn gui
voi thuc t, tuy nhin diu d khng c nghia hoc vin c th chi tham khao
gio trnh m khng di hoc. Nu cc ban mun hiu cn k kin thuc v nghia cua
gio trnh, ban nn tham gia cc kha hoc PHP dy du tai trung tm do tao
mang Vit Chuyn. Mc d d kim tra d xc thuc, cung nhu tnh dng dn cua
gio trnh, nhung khi bin soan chc chn s c t nhiu li lin quan dn tu
ngu, c php. Rt mong nhn duoc nhiu su dng gp cua cc ban. Moi kin dng
gp cua cc ban vui lng truy cp vo website: www.qhonline.info (l
website c nhn cua tc gia). Hoc www.ddcntt.vn (l website cua trung
tm). Giang vin Bi Quc Huy TP.H Ch Minh. Ngy 15 Thng 06 Nm 2006 Gio
trnh PHP Cn BanGiang Vin: Bi Quc Huy Trang 3/68www.qhonline.info
Phn A: Co Ban V HTML & Javascript I Cc The HTML co ban 1- Cu
trc chun: Tiu D Website Ni dung website duoc vit tai dy + Mt cu trc
HTML lun bao gm the dng v the mo. V du : the Mo The Dng -
Duoc phn bit bng du / ngay truoc the + Cc the HTML hon ton c th vit
hoa hoc thuong. Tuy nhin nn theo 1 quy tc chung (vit hoa th vit hoa
ht, nguoc lai). + Mt website cng t the th s cng chay nhanh hon. 2-
Cc the co ban : Tiu D: Ni Dung (v du: Welcome, admin).The H bao gm
cc thuc tnh tu (H1 H6). Nhung chi Su dung tu H1H3. In Dm: Ni
Dung (v du: Welcome, admin) In Nghing: Ni Dung (v du:
welcome, Admin) Gach Duoi : Ni Dung (V du: welcome, Admin) Xung 1
Dng :
- The ny khng c the dng. Xung 2 Dng : - C hoc khng the dng cung
duoc. Dinh Dang Chu Bng The + Kch thuoc chu : Ni Dung V du: Hello,
How Are You ?+ Kiu Chu : Ni Dung V du: Hello, How Are You ? + Mu
Chu : Ni Dung Gio trnh PHP Cn BanGiang Vin: Bi Quc Huy Trang
4/68www.qhonline.info V du: Hello, How Are You ? Tao Lin Kt : Ni
Dung V Du: Hello, Huy + Mo 1 cua s moi voi lin kt: TARGET=_BLANK V
du: Hello, Huy + Mo lin kt d ngay trn trang hin thi: TARGET=_SEFT V
du: Hello, Huy Dinh dang thuc tnh : ALIGN=LEFT, RIGHT, CENTER,
JUSTIFY + Su dung kt hop voi the V du: Ni dung Vn ban s o giua + Su
dung kt hop voi cc the khc nhu ,, ,. Chn hnh anh vo website: + c
php chnh d xut ra hnh anh. + c php duoc su dung khi hnh anh di km
voi lin kt. V du : Tu cu lnh trn s cho ra hnh def.gif. Tuy nhin bao
boc hnh anh d s c 1 duong vin. V du: Tu cu lnh trn s cho ra hnh
def.gif. Nhung khng c vin xung quanh + Hspace : khoang cch tu l
phai cua hnh dn l tri vn ban + Vspace: khoang cch tu TOP cua hnh dn
BOTTOM cua vn ban + Align : Dinh dang tri, phai, giua cua hnh (canh
l). + Width : Chiu rng cua tm hnh. + Height : Chiu cao cua tm hnh.
II To bang trong HTML : D tao 1 bang chng ta nn hnh dung duoc dng v
ct. V p dt 1 s quy lut, d vic thuc thi d hon so voi yu cu dt ra.
Gio trnh PHP Cn BanGiang Vin: Bi Quc Huy Trang
5/68www.qhonline.info Mt bang bao gm 2 thuc tnh l dng v ct. Vy ta c
quy tc d c 1 bang du liu. Ta di tu bang truoc, sau d ke dng v chia
ct trn dng dLm tun tu cho dn ht yu cu vic tao bang. 1 Bang bt du v
kt thc s c c php : 1 Dng bt du v kt thc s c c php : 1 Ct bt du v kt
thc s c c php : V du:ABCD 1234 Nhu bang o trn ta s xy dung nhu sau
: + Gm 1 bang. + Gm 2 dng + Gm 4 ct trn 1 dng Vy ta c c php tao
bang co ban nhu sau : A B C D 1 2 3 4 Cc thuc tnh trn Bang (Table).
oWidth : Chiu rng cua bang. Gio trnh PHP Cn BanGiang Vin: Bi Quc
Huy Trang 6/68www.qhonline.info oHeight: Chiu cao cua bang. oAlign
: Cc thuc tnh tri, phai, giua theo chiu ngang cua bang oValign : Cc
thuc tnh trn, duoi, giua theo chiu doc cua bang. oBackground : Mu
nn cua bang bng 1 hnh anh. (chi c tc dung trn ct v bang). oBgcolor
: Mu nn bang bng nhung mu theo thng s (chi c tc dung trn ct v
bang). V du: white, blue, green, red, oCellpadding : Khoang cch tu
chn chu dn canh duoi. oCellspacing : Khoang cch cua cc canh.
oRowspan : Gp theo dngV du : oColspan : Gp theo ct V du: * Cc thuc
tnh cua table pha trn du c th p dung di voi ct (td). Nhung khng th
p dung di voi dng. Bi Tp p Dng: Thit k 1 bang bng HTML nhu hnh bn
duoi :
Thu 2Thu 3Thu 4Thu 5Thu 6Thu 7 Ton A1Anh VnPHP&MYSQLKinh t
Chnh Tri Phng 301ASP.NETCCNAVt L A1 Yu cu : 1 Vit trn HTML, khng
dng bt ky tool h tro no. 2 Thoi gian trong 15 pht Gio trnh PHP Cn
BanGiang Vin: Bi Quc Huy Trang 7/68www.qhonline.info III To Form
nhp liu trong HTML : Form nhp liu duoc dng d ly du liu tu pha nguoi
truy cp, khch hng,.Thng quah thng website. C php co ban cua Form
cung c the bt du v kt thc : C php chnh : Ni dung cua form + Method
: L phuong thuc truyn nhn du liu. Gm 2 phuong thuc l POST v GET. +
Action : L duong dn dn lin kt xu l form. + Name : l tn cua Form
d.Co cu cua Form bao gm nhung thuc tnh sau : 1-Dang Text : (Nhu nhp
ho tn, dia chi, s Din Thoai,.) C php : + Type : Thuc tnh c hai loai
l Text (khi nguoi nhp s thy duoc ni dung dang nhpv Password (nguoi
nhp s khng thy duoc ni dung dang nhp) + Name : tn cua hp nhp liu (v
du: name, address, phone,..) + Size : Chiu di cua hp nhp liu. +
Value: Gi tri mun hin thi (thuong voi hp nhp liu th t su dung).
2-Dang Vn ban Textarea : (nhu nhp thng tin c nhn, ghi ch,..) C php
: + C the bt du v kt thc. + Name: Tn cua hp nhp liu. + Cols : Duoc
xem l chiu rng cua hp nhp liu + rows: Duoc xem l chiu cao cua hp
nhp liu 3-Dang Lua Chon : (nhu chon lua gioi tnh nam hoc nu) C php
: + Type : Radio l dinh dang dnh cho su lua chon + Value : Gi tri m
chng ta mun truyn khi user lua chon Gio trnh PHP Cn BanGiang Vin:
Bi Quc Huy Trang 8/68www.qhonline.info + Name : Tn cua dinh dang
lua chon + Thuc tnh checked. Nu add vo s mc dinh chon lua V du:
Male Female Tu v du trn ta thy nu trong 1 form chon lua gioi tnh.
Th thuc tnh name phai ging nhau. O dy. Thuc tnh male duoc lua chon
mc dinh. 4-Dang Thanh cuon : (nhu chon quc tich Vit Nam,.) C php:
Lua chon + Size : l kch thuoc cua hp thoai m ban mun. Thuong l 1. +
Name : l tn cua thanh cun y. + Option: l nhung thuc tnh ban mun
chon + Thuc tnh selected Nu thm vo s mc dinh chon lua. + Gi tri : l
thng t ban mun truyn vo khi chng ta chon lua. V du: Vit Nam Trung
Quc O v du ny chng ta thy. Vit Nam l quc gia duoc lua chon. 5-Dang
Chon Nhiu : (nhu bang dnh du so thch: music, sport, game,..) C Php:
+ Type= Checkbox l dinh dang cua hp thoai + Tn : l tn cua muc chon
lua + Gi tri: L thng s cn truyn vo. 6-Dang Nt Nhan : (nhu chp nhn
hoc lm lai,..) C php : Gio trnh PHP Cn BanGiang Vin: Bi Quc Huy
Trang 9/68www.qhonline.info Type c hai loai chnh l : submit b reset
+ Submit cho php goi du liu ln trnh duyt d xu l. + Reset : xa ton b
du liu tu cc form trn. Gi tri: l tn hin thi trn nt Tn : l tn cua nt
nhn. Bi tp p Dng : Vit lnh hin thi 1 form nhu bn duoi : Gio trnh
PHP Cn BanGiang Vin: Bi Quc Huy Trang 10/68www.qhonline.info IV- Cc
the nng cao: 1- Tao ch chay : C php co ban : Ni Dung M ta : Vn ban
nm giua hai the ny s di chuyn tuy theo cc gi tri thuc tnh duoc thit
lp. Mt s thuc tnh cua Marquee l:Direction: C gi tri bng Left hoc
Right l huong chuyn dng cua vn ban.
ScrollDelay:Gitringuynduongnylsmiligiyvnbanngungtruockhichuyn dng
tip. Gi tri cng nho, chuyn dng cng nhanh. Behavior: Loai chuyn dng
cua text. Scroll, Slide, Alternate Align With text: Doan vn ban
duoc canh chinh trong vng din tch cua marquee. C 3 gi tri: Top,
Middle, Bottom. Loop: Gi tri nguyn thit lp s chu ky chuyn dng cua
doan vn ban. V du : Cho mung ban d dn website cua chng ti 2 Su dung
Frame: Bng cch dng frame (khung), ta c th ngt trang web thnh cc vng
ring bit (cua s) v th hin cc tp tin HTML khc nhau trong mi vng. Voi
cch ny, mi vng c th chuyn sang trang web khc trong khi cc vng khc
vn khng thay di. C php co ban : SRC : URL cua trang mun hin thi.
Name : Tn cua frame Frameborder : Duong vin cua frame (thuong l 0
hoc 1) Height : chiu cao cua frame Width : Chiu rng cua frame.
Scrolling : Hin thi thanh truot (c 3 thuc tnh l No, Yes, Auto).
Allowtransparency: Cho php background cua frame trong sut. Gio trnh
PHP Cn BanGiang Vin: Bi Quc Huy Trang 11/68www.qhonline.info V du :
3- Tao danh sch: HTML c mt tp cc the cho php tao ra cc danh sch
dang phn cp. C hai dang danh sch: khng c thu tu v c thu tu. Cc danh
sch khng c thu tu l danh sch dang nt, trong khi d danh sch c thu tu
thuong l danh sch c dnh s. Ta cung c th kt hop hai loai ny d tao ra
danh sch phuc tap hon. a) Danh sch c thu tu : Cc muc cua mt danh
sch c thu tu duoc hin thi voi cc con s thay v cc nt. Su dung the
(Order List) d thit lp mt danh sch c thu tu, nhu duoc th hin trong
doan m sau. Hnh anh th hin cch m trnh duyt hin thi doan m ny. C Php
: V du : This is the first level-1 item in the list. This is the
second level-1 item in the list. This is the first level-2 item in
the list. And this is the second level-2 item in the list. This is
the third level-1 item in the list. b) Danh sch khng c thu tu : C
php :
V du :
- This is the first level header.
- This is the first level-1 item in the list.
- This is the second level-1 item in the list.
- This is the first level-2 item in the list.
- And this is the second level-2 item in the list.
- This is the third level-1 item in the list.
Gio trnh PHP Cn BanGiang Vin: Bi Quc Huy Trang
12/68www.qhonline.info 4- Su dung the : DIV Duoc xem nhu l cc the
chua (the mang). Chng rt huu dung trong vic phn chia cc khi vn ban
voi phn xung quanh n m khng lm anh huong dn dinh dang cua ring n.
Cc the ny thuong duoc dng voi cc dinh dang style sheet CSS v dang
duoc ua chung trong thit k layout cua nhung trang web phuc tap. V
du :Here is some text in a DIV. V- CASCADING STYLE SHEET (CSS)Dinh
nghia v bang kiu xp chng (css) su dung d tch bit format trang v ni
dung cua trang web. Voi CSS, ta c th bin di moi thu tu kch c, kiu,
mu sc cua vn ban cho dn khoang cch giua cc chu ci v cc dng, duong
bin v phn dm xung quanh phn tu, vi tr chnh xc cua di tuong trn
trang. 1- inh nghia truc tip : Bang kiu ton cuc (hoc bang kiu duoc
nhng vo) duoc km theo nhu l mt phn cua h so HTML. Loai bang kiu ny
xc dinh bin gioi cua n bng the mo v the dng , n thuong duoc dt
trong phn head cua trang HTML. V du: H1 {font-size: 16pt;
font-weight: bold; color: red} H2 {font-style: italic; font-size:
24pt; color: green} DIV {font-weight: bold; font-style: italic}
This text is in a DIV. This text is in an H1. This text is in an
H2. Gio trnh PHP Cn BanGiang Vin: Bi Quc Huy Trang
13/68www.qhonline.info Hin Thi : M ta thuc tnh : Color: mu chu
Font-size : Kch thuoc cua chu Font-style : Dinh dang chu (italic :
Nghing, blod: in dm, underline: gach duoi). Font-family: Kiu chu
Background-color : mu nn Text decoration: Dinh dang link. + None :
khng dinh dang g ca + Underline: gach duoi lin kt. + Overline: gach
trn lin kt 2- inh nghia gin tip: Kha nng dinh dang duoc d cp trong
nhung phn truoc khng chi dung lai o muc d cua mt trang web don m cn
c th kim sot kiu trn nhiu trang web hay c th trn ton b websitebng
cch su dung bang kiu lin kt. Mt bang kiu lin kt (hay bang kiu bn
ngoi) chi don gian l mt tp tin vn ban, bao gm nhung dinh nghia kiu.
Tp tin ny duoc luu voi phn mo rng l CSS. Tp ny (nm ngoi tp tin
HTML) c th duoc tham chiu hoc lin kt boi vn ban HTML bng cch su
dung the cua trang HTML. V du: Du tin, su dung notepad d soan thao
tp tin c ni dung nhu sau: H1 {font-size: 16pt;font-weight: bold;
color:red} H2 {font-style: italic; font-size:24pt ; color:green}
DIV {font-weight: bold; font-style: italic} Gio trnh PHP Cn
BanGiang Vin: Bi Quc Huy Trang 14/68www.qhonline.info Luu tp tin
voi tn bt ky c phn mo rng l CSS (v du: style.css). Cung cn ch rng,
bang kiu lin kt ny khng km theo cc thnh phn v (tuc trong file CSS
khng c cc the ny). By gio tp tin tao mt file HTML chua mt lin kt dn
bang kiu bn ngoi d dinh nghia. V du: This text is in a DIV. This
text is in an H1. This text is in an H2. This is modified H2 text.
Trong v du ny tp tin su dung the trong phn du cua h so HTML. The ny
chua thuc tnh HREF xc dinh vi tr cua tp tin dch. Thuc tnh REL s
dinh r rng lin kt ny l mt tham chiu dn mt bang kiu v thuc tnh TYPE
dinh r loai bang kiu. Thoi dim hin tai th text/css l loai bang kiu
duoc h tro ph bin v duy nht.Bang kiu lin kt c anh huong toi h so
HTML ging nhu bang kiu ton cuc (bang kiu nhng). Moi phn tu trong h
so HTML m the cua chng duoc dinh nghia trong tp tin style.css s
duoc th hin bng cch su dung kiu d duoc xc dinh. V khng nm trong bt
ky tp tin HTML dc bit no, nn bang kiu lin kt ngoi c th duoc lin kt
voi s luong h so khng gioi han. V du, tp tin c th tao bang kiu cho
tonb Website v lin kt tung trang voi bang kiu d. Kha nng ny rt huu
ch khi tp tin mun duy tr cch th hin, cung nhu cch cam nhn nht qun
trn ton b website. N cung rt tin loi khi mun thay di cch th hin tng
th cua Website. 3- inh Nghia Trn 1 Lop: Gio trnh PHP Cn BanGiang
Vin: Bi Quc Huy Trang 15/68www.qhonline.info L mt bin dinh nghia
format cua cc thuc tnh trong cc the nhung moi the du c th dng duoc.
C php :.tnlop {cc thuc tnh}. V du: .large { font-size: 24pt;
font-style : bold; font-family : tahoma; color: green;
Background-color: blue; } .small {font-size: 8pt} The small class
on an H2 element. The large class on a DIV element.
The small class on a P element. The large class on a B
element.
Gio trnh PHP Cn BanGiang Vin: Bi Quc Huy Trang
16/68www.qhonline.info Phn B: PHP & MYSQL Bi 1: Tng Quan V PHP
I - Gii thiu v PHP. PHP (Hypertext Preprocessor) l ngn ngu script
trn server duoc thit k d d dng xy dung cc trang Web dng. M PHP c th
thuc thi trn Webserver d tao ra m HTML v xut ra trnh duyt web theo
yu cu cua nguoi su dung. Ngn ngu PHP ra doi nm 1994 Rasmus Lerdorf
sau d duoc pht trin boi nhiu nguoi trai qua nhiu phin ban. Phin ban
hin tai l PHP 5 d duoc cng b 7/2004. C nhiu l do khin cho vic su
dung ngn ngu ny chim uu th xin nu ra dy mt s l do co ban : -M ngun
mo (open source code) -Min ph, download d dng tu Internet. -Ngn ngu
rt d hoc, d vit. -M ngun khng phai sua lai nhiu khi vit chay cho cc
h diu hnh tu Windows, Linux, Unix -Rt don gian trong vic kt ni voi
nhiu ngun DBMS, v du nhu : MySQL, Microsoft SQL Server 2000,
Oracle, PostgreSQL, Adabas, dBase, Empress, FilePro, Informix,
InterBase, mSQL, Solid, Sybase, Velocis v nhiu h thng CSDL thuc H
Diu Hnh Unix (Unix dbm) cng bt cu DBMS no c su h tro co ch ODBC
(Open Database Connectivity) v du nhu DB2 cua IBM. So d v lp trnh
server side cua PHP. Gio trnh PHP Cn BanGiang Vin: Bi Quc Huy Trang
17/68www.qhonline.info 1: Trnh duyt gui yu cu toi trang PHP.2: Web
server gui cc yu cu d toi trnh thng dich
PHP.3-4:TrnhthngdichPHPthucthiccdoanmPHP.Qutrnhnycth lin quan dn
nhiu ti nguyn nhu filesystem, database... 5: Kt qua cua qu trnh
thng dich l cc m HTML duoc tra v cho Server..6: Server gui m kt qua
HTML v lai trnh duyt. II- Kin Thc Co ban 1- C php chnh : PHP cung c
the bt du v kt thc ging voi ngn ngu HTML. Chi khc, di voi PHP chng
ta c nhiu cch d th hin. Cch 1 : C php chnh: Cch 2: C php ngn gon
Cch 3: C php ging voi ASP. Mc d c 3 cch th hin. Nhung di voi 1 lp
trnh vin c kinh nghim th vic su dung cch 1 vn l lua chon ti
uu.Trong PHP d kt thc 1 dng lnh chng ta su dung du ; D ch thch 1
doan du liu no d trong PHP ta su dung du // cho tung dng. Hoc dng
cp the /*..*/ cho tung cum m lnh. V du: 2- Xuat d liu ra trnh duyt
D xut du liu ra trnh duyt chng ta c nhung dng c php sau : + Echo
Thng tin; Gio trnh PHP Cn BanGiang Vin: Bi Quc Huy Trang
18/68www.qhonline.info + Printf Thng tin; Thng tin bao gm : bin,
chui, hoc lnh HTML . V du : Nu giua hai chui mun lin kt voi nhau ta
su dung du . V du : 3- Khi nim bin, hng, chuoi v cc kiu d liu. a)
Bin trong PHP. Bin duoc xem l vng nho du liu tam thoi. V gi tri c
th thay di duoc. Bin duoc bt du bng k hiu $. V theo sau chng l 1
tu, 1 cum tu nhung phai vit lin hoc c gach duoi. 1 bin duoc xem l
hop l khi n thoa cc yu t : + Tn cua bin phai bt du bng du gach duoi
v theo sau l cc k tu, s hay du gach duoi. + Tn cua bin khng duoc
php trng voi cc tu kha cua PHP. Trong PHP d su dung 1 bin chng ta
thuong phai khai bo truoc, tuy nhin di voi cc lp trnh vin khi su
dung ho thuong xu l cng mt lc cc cng vic, nghia l vua khi bo vua gn
du liu cho bin. Ban thn bin cung c th gn cho cc kiu du liu khc. V
ty theo dinh cua nguoi lp trnh mong mun trn chng. Mt s v du v bin :
$a= 100 // bin a o dy c gi tri l 100. $a= PHP is easy // Bin a o dy
c gi tri PHP Is easy. Biena=123 //C li v bt du 1 bin phai c du $
$123a=PHP //C li v phn tn bt du cua bin l dang s. Gio trnh PHP Cn
BanGiang Vin: Bi Quc Huy Trang 19/68www.qhonline.info b) Khi nim v
hng trong PHP. Nu bin l ci c th thay di duoc th nguoc lai hng l ci
chng ta khng th thay di duoc. Hng trong PHP duoc dinh nghia boi hm
define theo c php: define (string tn_hng, gi_tri_hng ). Cung ging
voi bin hng duoc xem l hop l th chng phai dp ung 1 s yu t : + Hng
khng c du $ o truoc tn. + Hng c th truy cp bt cu vi tr no trong m
lnh + Hng chi duoc php gn gi tri duy nht 1 ln. + Hng thuong vit bng
chu in d phn bit voi bin V du : define (C, COMPANY); define
(YELLOW, #ffff00); c) Khi nim v chuoi: Chui l mt nhm cc k tu, s,
khoang trng, du ngt duoc dt trong cc du nhy. V du: Huy welcome to
VietNam D tao 1 bin chui, chng ta phai gn gi tri chui cho 1 bin hop
l. V du: $fisrt_name= Nguyen; $last_name= Van A; D lin kt 1 chui v
1 bin chng ta thuong su dung du . V du: d) Kiu d liu trong PHP Cc
kiu du liu khc nhau chim cc luong b nho khc nhau v c th duoc xu l
theo cch khc nhau khi chng duoc theo tc trong 1 script. Gio trnh
PHP Cn BanGiang Vin: Bi Quc Huy Trang 20/68www.qhonline.info Trong
PHP chng ta c 6 kiu du liu chnh nhu sau : Kiu D LiuV dM Ta
Integer10Mt s nguyn Double5.208Kiu s thuc StringHow are you ?Mt tp
hop cc k tu BooleanTrue or FalseGi tri true hoc false ObjectHuong
di tuong trong PHP ArrayMang trong PHP, chua cc phn tu. Chng ta c
th su dung hm dung sn gettype() cua PHP4 d kim tra kiu cua bt ky
bin. V du: III- Tng Kt: Sau bi ny cc ban d c nhung khi nim du tin v
PHP, cc c php, cc kiu du liu, v cch lm vic voi mi truong PHP nhu th
no. O bi sau, chng ta s tip tuc tip cn voi cc thut ton v c php PHP
mt cch r rng vquen thuc trong cc ngn ngu lp trnh. Gio trnh PHP Cn
BanGiang Vin: Bi Quc Huy Trang 21/68www.qhonline.info Bi 2 : Ton Tu
V Biu Thuc I Ton tu co ban. 1- Ton tu gn: Chng ta d tung tip xc voi
ton tu ny boi vic khoi tao 1 bin. N gm k tu don =. Ton tu gn ly gi
tri cua ton hang bn phai gn n vo ton hang bn tri. V du: $name =
Johny Nguyen; 2- Ton tu so hoc: Ta c bang cc php ton s hoc nhu sau:
Ton TuL giaiV dKt qua +Cng hai s hang10+818 -Tru hai s hang10-82
*Nhn hai s hang10*880 /Chia hai s hang10/33.33333333 %Tra v s
du10%31 3- Ton tu so snh: Ta c cc php so snh co ban nhu sau: Php
TonTnGiai ThchV D = =BngHai s hang bng nhau$a= =5 !=Khng bngHai s
hang khng bng nhau$a != 5 = = =Dng nhtHai s bng nhau v cng kiu$a =
= = 5 >Lon honV tri lon hon v phai$a > 5 >=Lon hon hoc
bngV tri lon hon hoc bng v phai$a >= 5
