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• N •
\n (new line), 46–47, 82
natcasesort
function, 357
native language support, 307
natsort
function, 105, 357
nesting, 121–122, 143, 147
Netscape Enterprise Server. SeeiPlanet
Web server
Net_SMTP package, 309
Net_Socket package, 309
new line character (\n), 46–47, 82
new
statement, 190
next
function, 108, 357
nl2br
function, 372
notices, 67. See alsoerror messages
number_format
function, 79–80, 368
numbers
numeric data types, 73, 75–80, 89–92
in variable names, 54
• O •
object-oriented programming
classes, 178–179, 182–191
definition of, 17, 177–178
developing a program using, 181–189
exception handling, 194
inheritance, 180–181
methods, 179–180, 182, 185–186, 191–193
multiple inheritance, not supported, 181
objects, 178–179, 181, 195, 196
polymorphism, not supported, 181
properties, 179, 182, 184–185, 191–193
objects
choosing, 181
copying, 195
creating (instantiating), 190
definition of, 178–179
destroying, 196
octdec
function, 368
odbc extension, 304
ODBC (Open Database Connectivity)
standard, 12, 260
open source license for PHP, 10
open source software, 261
opendir
function, 284, 364
OpenSSL, 308, 343
operating system commands. Seesystem
commands
operating systems, 10, 26, 124
or
, joining comparisons with, 138
Oracle databases, 12, 260, 263, 343
ord
function, 372
order of execution, 129–130
order of operations, 77–78
outgoing mail server, 297–299
output statements, 44–48, 79–80, 89–92,
225, 324
• P •
packages. SeePEAR
parentheses (())
affecting order of comparisons, 139
affecting order of operation, 77–78
confusing with curly braces, 326
indicating function call, 162, 167
mismatched, 325–326
in pattern matching, 134
parse_url
function, 366, 372
parsing errors, 36
parsing, tokenizer extension for, 304
passthru
function, 287, 290–291, 364
passwords, 238, 307
pathinfo
function, 281, 365
pattern matching (regular expressions)
definition of, 133–134
example patterns, 135–137
Perl-compatible, extension for, 304
special characters for, 134–135
validating HTML form information
with,214
pcre extension, 304
PCs For Dummies(Gookin), 25
PDF documents, extensions for, 306–308
PEAR (PHP Extension and Application
Repository)
definition of, 309
finding packages in, 309–311
installing packages, 313–314
listing installed packages, 314
packages included with PHP, 309
setting up, 311–313
uninstalling packages, 314
386
PHP 5 For Dummies
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