Specifications
discussion board application
821
decrement operators,
28-29
decryption, 294
default values, database
optimization, 262
delete bm() function, 531
DELETE privilege, 190
DELETE statement, 225
delete story.php, 596
delete_account() function,
636
delete_fns.php, 611
delete_bms.php, 501
delete_message()
function, 648
deleting
accounts (Warm Mail
application), 636-637
bookmarks, 530-532
databases, 242
directories, 361
email (Warm Mail applica-
tion), 648
files, 63, 364-365
records, 225
deletion anomalies,
avoiding (Web data-
bases), 178
Denial of Service (DoS),
287
deregistering variables,
434-436
DES (Data Encryption
Standard), 295
DESC keyword, 220
descenders (letters), 417
DESCRIBE command,
198-199
DESCRIBE statement, 257
syntax, 257
describe user, [edit, OK]
statement, 247
designing
databases, 597-598
Web databases, 176-180
atomic column values,
178
keys, creating, 179
null values, avoiding,
179-180
real-world objects,
modeling, 176
redundant data,
avoiding, 176-178
table types, 180
update anomalies,
avoiding, 177-178
designing classes,
158-159
designs, database opti-
mization, 261
design_button.html file,
411-412
destroying sessions, 435
Developer Shed Web site,
116
developing function
libraries, 467
development environ-
ments, 469
Devshed Web site, 428
DevShed.com Web site,
804
diagrams, online newslet-
ters, 658-660
die() language construct,
450
digest authentication
(HTTP), 313
digital certificates,
297-298
digital goods (commercial
Web sites), providing,
275-276
digital signatures,
296-297
directives
magic_quotes_gpc, 336
magic_quotes_runtime,
336
php.ini file, 453-454
directories
browsing, 358
creating, 361
current symbol (.), 359
deleting, 361
file listings, 359
file paths, 360
functions, 358
one level up symbol (..),
359
reading from, 358-360
uploaded file listing, code,
358-359
directory sites, verifying
URLs and email
addresses, 374-378
directory structures, 467
component structures, 467
dirname($path) function,
360
dirname() function, 363
disconnecting from Web
databases, 238
discussion board
application, 712-741
article list, 718-731
collapsing threads, 719,
723
displaying articles, 724
expanding threads,
719-723
individual articles,
viewing, 731-734
new articles, adding,
734-741
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