SYMBOL]
[A]
[B]
[C]
[D]
[E]
[F]
[G]
[H]
[I]
[J]
[K]
[L]
[M]
[N]
[O]
[P]
[Q]
[R]
[S]
[T]
[U]
[V]
[W]
[X]
[Z]
. (dot)
in HTML field name, converting to PHP variable
!== (nonidentity) operator
2nd
" (quotes, double)
converting to HTML entities
2nd
3rd
in double-quoted strings
escaping for SQL
escaping in queried data
in strings
variable interpolation in a double-quoted string
"Undefined variable" error message
#! (hash-bang) syntax, PHP scripts beginning with
$ (dollar sign)
$_ in superglobal array names
in double-quoted strings
end of line anchor for patterns
$_COOKIE superglobal array
2nd
3rd
$_ENV superglobal array
2nd
$_FILES superglobal array
uploaded file processing
$_GET superglobal array
2nd
$_POST superglobal array
2nd
3rd
$_REQUEST superglobal array
2nd
$_SERVER superglobal array
$_SESSION superglobal array
2nd
3rd
$parent( )
$pc_timezones array
% (percent sign)
SQL wildcard character
strftime( ), formatting characters preceded by
& (ampersand)
& (logical AND) operator
argument separator for URLs
before function name, returning values by reference
before function parameter names, passing parameters by reference
converting to HTML entity
2nd
3rd
placeholder in database queries
< > (angle brackets)
>& (redirection) operator
< and >, converting to HTML entities
2nd
3rd
<<< in heredocs
2nd
<? and ?>, PHP start and end tags
programming conventions in this book
<br /> tags (XHTML), converting carriage returns to
<img> tag (localized)
' (quotes, single)
escaping for SQL
in command-line arguments
in function return values
marking strings in queried data
in strings
( ) (parentheses)
embedding comments in email addresses
grouping characters and capturing in patterns
* (asterisk)
regular expression metacharacter
SQL and shell globbing wildcard
+ (plus sign)
+ operator, merging arrays
regular expression metacharacter
, (comma)
array elements, separating
data separated by, parsing
-> operator, accessing methods or member variables
. (dot)
. (current directory) and .. (parent directory)
recreating full filename from parts
regular expression metacharacter
string concatenation operator
/ (slash)
/** and */ in PHPDoc comments
pathname separator on Unix
2nd
recreating full filename from parts
regular expression pattern delimiters
2nd
/bin/stty (controlling terminal characteristics)
/dev/null (Unix), redirecting output to
/i (case-insensitive) pattern modifier
/tmp directory, cookie storage in
/usr/bin/last command
:: (colon) operator, accessing class methods or member variables
; (semicolon)
argument separator for URLs
end of statement character
= (equal sign)
= (assignment) operator, == vs.
=& (assignment) operator
2nd
=> operator
instructing arrays to use different index
specifying key/value pairs for arrays
== (equality) operator
=== (identity) operator
? (question mark)
?\: (ternary) operator
after quantifiers, for nongreedy matching
placeholder in database queries
regular expression metacharacter
@ (at sign) in PHPDoc commands
[ ] (brackets)
character classes in regular expressions
in double-quoted strings
variables, treating as arrays
\ (backslash)
double-quoted string escape sequence
escaping for SQL
escaping regular expression pattern delimiters
escaping SQL and shell globbing wildcards
pathname separator on Windows
2nd
\b (word boundary), regular expression metasymbol
2nd
\d (digit) metasymbol in regular expressions
\ddd (octal codes for characters)
\n
[See newlines]
\s (whitespace) metasymbol
2nd
\w (word) metasymbol
2nd
^ (caret)
beginning of line anchor for patterns
inverting character class
_ (underscore)
_ _FILE_ _ and _ _LINE_ _ constants
_( ) alias for gettext( )
replacing . (dot) in variable names
SQL wildcard character
_getch( )
_write( ) (pc_DB_Session)
` (backtick) operator
using with ls (Unix) or dir (Windows)
{ } (braces)
array elements, resolving ambiguity about
dereferencing objects
in double-quoted strings
empty set
expressions between, evaluation in PHP
in variable interpolation
| for alternation in pattern matching
~ (logical NOT)
0 (zero)
as empty variable
numbers beginning with
return values from functions
in string escape sequences
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