Index: Symbols & Numbers

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Symbols

' (apostrophe), escaping in single-quoted strings: 3.2.1. String Literals (JavaScript)

* (asterisk)

*= (assignment) operator: 5.9.1. Assignment with Operation (JavaScript)

*= (multiplication assignment) operator: 2.4.12.2. Assignment with operation (Programming PHP)

* (multiplication) operator: 12.6. Operators (Dynamic HTML)

2.4.5. Arithmetic Operators (Programming PHP)

as wildcard character: 3.8.3. Universal Selectors (Dynamic HTML)

frame size: 4.1. Frame Layout (Webmaster in a Nutshell)

in greedy and non-greedy quantifiers: 4.10.5. Quantifiers and Greed (Programming PHP)

media type wildcard: 17.5. Media Types and Subtypes (Webmaster in a Nutshell)

multiplication operator: 5.2.3. Operator Precedence (JavaScript)

5.3. Arithmetic Operators (JavaScript)
5.3. Arithmetic Operators (JavaScript)

quantifier, in regular expressions: 10.1.3. Repetition (JavaScript)

regular expression metacharacter: 13.1. Introduction (PHP Cookbook)

SQL and shell globbing wildcard: 10.10.3. Discussion (PHP Cookbook)

@ (at sign)

error suppression operator: 2.4.13. Miscellaneous Operators (Programming PHP)
in PHPDoc commands: 21.9.2. Solution (PHP Cookbook)
@ operator prefixing function calls: 4.1.4. Error Handling of MySQL Database Functions (Web Database Applications)

\ (backslash)

double-quoted string escape sequence: 1.1. Introduction (PHP Cookbook)

escape sequences in string literals: 3.2.1. String Literals (JavaScript)

escape sequences, string literals and regular expressions: 10.3. The RegExp Object (JavaScript)

escaping

in lookbehind pattern assertions: 4.10.10. Lookahead and Lookbehind (Programming PHP)
in single-quoted strings: 4.1.2. Single-Quoted Strings (Programming PHP)
regular expression metacharacters: 4.8.1. The Basics (Programming PHP)

escaping for SQL: 10.1. Introduction (PHP Cookbook)

escaping regular expression pattern delimiters: 13.2.3. Discussion (PHP Cookbook)

escaping SQL and shell globbing wildcards: 10.10.3. Discussion (PHP Cookbook)

in SQL queries: 4.5.3. SQL (Programming PHP)

literal characters in regular expressions: 10.1.1. Literal Characters (JavaScript)

\n in regular expressions: 10.1.4. Alternation, Grouping, and References (JavaScript)

pathname separator on Windows: 18.1. Introduction (PHP Cookbook)

19.5.3. Discussion (PHP Cookbook)

removing from escaped strings: A.3d. Alphabetical Listing of PHP Functions (r-z) (Programming PHP)

` (backtick) operator: 18.23.2. Solution (PHP Cookbook)

2.4.13. Miscellaneous Operators (Programming PHP)
security risks of: 12.7. Shell Commands (Programming PHP)
using with ls (Unix) or dir (Windows): 19.9.3. Discussion (PHP Cookbook)

! (bang)

!= (inequality) operator: 12.6. Operators (Dynamic HTML)
!== (nonidentity) operator: 12.6. Operators (Dynamic HTML)
! (NOT) operator: 12.6. Operators (Dynamic HTML)
ranking declarations with: 3.9.1. Making a Declaration Important (Dynamic HTML)

{ } (braces)

3.6.1.1. The <style> tag (Dynamic HTML)

3.6.1.2. The style attribute in element tags (Dynamic HTML)

3.6.2.3. The @import rule (Dynamic HTML)

{{{ and }}} sequences in comments: 14.3.4. Fleshing Out the Skeleton (Programming PHP)

as pattern delimiters: 4.10.1. Delimiters (Programming PHP)

enclosing array lookup in: 5.4. Multidimensional Arrays (Programming PHP)

in code blocks: 2.1.2. Statements and Semicolons (Programming PHP)

2.5.1. if (Programming PHP)

variable interpolation in strings: 4.1.1. Variable Interpolation (Programming PHP)

array elements, resolving ambiguity about: 5.5.3. Discussion (PHP Cookbook)

dereferencing objects: 12.5.3. Discussion (PHP Cookbook)

in double-quoted strings: 1.1. Introduction (PHP Cookbook)

empty set: 4.25.3. Discussion (PHP Cookbook)

expressions between, evaluation in PHP: 5.5.3. Discussion (PHP Cookbook)

in variable interpolation: 17.4.3. Discussion (PHP Cookbook)

[ ] (brackets)

accessing array elements: 3.6. Arrays (JavaScript)

5.10.7. Array and Object Access Operators (JavaScript)
9.1.2. Reading and Writing Array Elements (JavaScript)
in arrays of arrays: 9.1.5. Multidimensional Arrays (JavaScript)

accessing object properties: 3.5. Objects (JavaScript)

6.9. for/in (JavaScript)
8.6. Objects as Associative Arrays (JavaScript)

as pattern delimiters: 4.10.1. Delimiters (Programming PHP)

character classes in regular expressions: 13.1. Introduction (PHP Cookbook)

in double-quoted strings: 1.1. Introduction (PHP Cookbook)

[[:>:]] end of word anchor in regular expressions: 4.9.2. Anchors (Programming PHP)

in regular expression character classes: 4.8.2. Character Classes (Programming PHP)

regular expression character classes: 10.1.2. Character Classes (JavaScript)

start of word anchor in regular expressions: 4.9.2. Anchors (Programming PHP)

variables, treating as arrays: 9.11.2. Solution (PHP Cookbook)

^ (caret)

^= (bitwise XOR assignment) operator: 2.4.12.2. Assignment with operation (Programming PHP)

^ (bitwise XOR) operator: 2.4.9. Bitwise Operators (Programming PHP)

beginning of line anchor for patterns: 13.1. Introduction (PHP Cookbook)

beginning of line or string, matching: 10.1.5. Specifying Match Position (JavaScript)

inverting character class: 13.1. Introduction (PHP Cookbook)

negating character class elements: 10.1.2. Character Classes (JavaScript)

negating regular expression character classes: 4.8.2. Character Classes (Programming PHP)

start of line anchor, Perl regular expressions: 4.10.4. Anchors (Programming PHP)

start of string anchor in regular expressions: 4.8.1. The Basics (Programming PHP)

4.9.2. Anchors (Programming PHP)

XOR (exclusive or) operator: 5.8. Bitwise Operators (JavaScript)

^ (caret), exclusive OR operator: 12.6. Operators (Dynamic HTML)

: (colon)

ending if line: 2.5.1. if (Programming PHP)
in labels: 6.10. Labels (JavaScript)

:: (colon) operator, accessing class methods or member variables: 7.1. Introduction (PHP Cookbook)

, (comma)

, (comma) operator: 12.6. Operators (Dynamic HTML)

6.2. Compound Statements (JavaScript)
combining multiple expressions in loops: 6.8. for (JavaScript)
4.5.1. Centering an Object (Dynamic HTML)

array elements, separating: 4.10.1. Problem (PHP Cookbook)

as delimiter: 3.7.3. Descendant Selectors (Dynamic HTML)

ASCII value for: 4.7.4. String-Searching Functions (Programming PHP)

data separated by, parsing: 1.10.1. Problem (PHP Cookbook)

two or more, skipping array values in list( ): 5.5. Extracting Multiple Values (Programming PHP)

{} (curly braces)

CSS style sheets: 9.2. Style Syntax (Webmaster in a Nutshell)

delimiting statement blocks: 6.2. Compound Statements (JavaScript)

6.14. function (JavaScript)

JavaScript: 11.2.10.2. Compound statements (Webmaster in a Nutshell)

in object literals: 3.5.2. Object Literals (JavaScript)

in regular expressions: 10.1.3. Repetition (JavaScript)

$ (dollar sign)

$_ in superglobal array names: 9.1. Introduction (PHP Cookbook)

anchor character (regular expressions): 10.1. Defining Regular Expressions (JavaScript)

in double-quoted strings: 1.1. Introduction (PHP Cookbook)

end of line anchor for patterns: 13.1. Introduction (PHP Cookbook)

in identifiers: 2.7. Identifiers (JavaScript)

in regular expressions: 4.8.1. The Basics (Programming PHP)

4.9.2. Anchors (Programming PHP)
4.10.2. Match Behavior (Programming PHP)
4.10.4. Anchors (Programming PHP)

in variable names: 2.1.6.1. Variable names (Programming PHP)

2.3. Variables (Programming PHP)

pattern matching, end of line or string: 10.1.5. Specifying Match Position (JavaScript)

10.1.5. Specifying Match Position (JavaScript)

regular expession string matches: 23. Core JavaScript Reference (JavaScript)

$ (dollar sign), PHP variable names: 16.4. Variables (Webmaster in a Nutshell)

. (dot)

.+ (concatenation assignment) operator: 2.4.12.2. Assignment with operation (Programming PHP)

. (current directory) and .. (parent directory): 19.8.3. Discussion (PHP Cookbook)

. operator: 3.5. Objects (JavaScript)

5.10.7. Array and Object Access Operators (JavaScript)
8.1.2. Setting and Querying Properties (JavaScript)
8.6. Objects as Associative Arrays (JavaScript)

. (string concatenation) operator: 2.4.6. String Concatenation Operator (Programming PHP)

in HTML field name, converting to PHP variable: 9.10.1. Problem (PHP Cookbook)

in cookie names, decoding: 7.6.1. Cookies (Programming PHP)

in HTML field names, converting for PHP variables: 7.4.2. Parameters (Programming PHP)

recreating full filename from parts: 19.5.3. Discussion (PHP Cookbook)

regular expression character classes: 10.1.2. Character Classes (JavaScript)

regular expression metacharacter: 13.1. Introduction (PHP Cookbook)

single-character matches in regular expressions: 4.8.1. The Basics (Programming PHP)

string concatenation operator: 1.8.2. Solution (PHP Cookbook)

wildcard match character: 4.10.2. Match Behavior (Programming PHP)

= (equal sign)

= (assignment) operator: 5.7.1.1. IE text (Dynamic HTML)

6.3.2. Event Handlers as Object Properties (Dynamic HTML)
12.6. Operators (Dynamic HTML)
5.9. Assignment Operators (JavaScript)
precedence of: 5.2.3. Operator Precedence (JavaScript)

= (assignment) operator, == vs.: 5.2.1. Problem (PHP Cookbook)

== (equality) operator: 12.6. Operators (Dynamic HTML)

5.4.1. Equality (==) and Identity (===) (JavaScript)

4.12.3. Discussion (PHP Cookbook)

Netscape 4, JavaScript 1.2 implementation: 5.4.1.1. Equality and inequality in Netscape (JavaScript)

11.6. Netscape's JavaScript 1.2 Incompatibilities (JavaScript)

null and undefined value, comparing: 3.8. undefined (JavaScript)

rules for determining equality: 5.4.1. Equality (==) and Identity (===) (JavaScript)

strings, comparing: 5.6. String Operators (JavaScript)

=== (identity) operator: 12.6. Operators (Dynamic HTML)

5.4.1. Equality (==) and Identity (===) (JavaScript)
5.2.3. Discussion (PHP Cookbook)
case expressions, testing for identity: 6.5. switch (JavaScript)
distinguishing null and undefined values: 3.8. undefined (JavaScript)
Netscape 4, JavaScript 1.2 implementation: 11.6. Netscape's JavaScript 1.2 Incompatibilities (JavaScript)
rules for determining identical values: 5.4.1. Equality (==) and Identity (===) (JavaScript)

=& (assignment) operator: 6.7.2. Solution (PHP Cookbook)

7.6.2. Solution (PHP Cookbook)

=> operator

instructing arrays to use different index: 4.2.2. Solution (PHP Cookbook)
specifying key/value pairs for arrays: 4.1. Introduction (PHP Cookbook)

=> symbol, separating array indexes from values: 5.3. Storing Data in Arrays (Programming PHP)

= (equals sign)

= (assignment) operator: 2.4.12.1. Assignment (Programming PHP)

== (equal to) operator: 2.2.3. Strings (Programming PHP)

2.4.8. Comparison Operators (Programming PHP)
comparing strings with: 4.6.1. Exact Comparisons (Programming PHP)

=== (identity) operator: 2.4.8. Comparison Operators (Programming PHP)

comparing strings with: 4.6.1. Exact Comparisons (Programming PHP)
testing return value for failure: 4.7.4. String-Searching Functions (Programming PHP)

! (exclamation point)

!= (inequality) operator: 5.4.2. Inequality (!=) and Non-Identity (!==) (JavaScript)

2.4.8. Comparison Operators (Programming PHP)
Netscape 4, JavaScript 1.2 implementation: 11.6. Netscape's JavaScript 1.2 Incompatibilities (JavaScript)
strings, comparing: 5.6. String Operators (JavaScript)

!== (non-identity) operator: 5.4.2. Inequality (!=) and Non-Identity (!==) (JavaScript), Netscape 4, JavaScript 1.2 implementation: 11.6. Netscape's JavaScript 1.2 Incompatibilities (JavaScript)

!== (not identical) operator: 2.4.8. Comparison Operators (Programming PHP)

! (NOT) operator: 5.4.2. Inequality (!=) and Non-Identity (!==) (JavaScript)

logical NOT operator: 5.7.3. Logical NOT (!) (JavaScript)

type specification modifier: 14.7. Parameter Handling (Programming PHP)

| for alternation in pattern matching: 13.1. Introduction (PHP Cookbook)

/ (forward slash)

/ (division) operator: 5.3. Arithmetic Operators (JavaScript)

/* and */, in comments: 2.5. Comments (JavaScript)

//, in comments: 1.8. Example: Computing Loan Payments with JavaScript (JavaScript)

2.5. Comments (JavaScript)
20.3.1. Hiding Scripts from Old Browsers (JavaScript)

in regular expressions: 3.10. Regular Expressions (JavaScript)

-> operator, accessing methods or member variables: 7.1. Introduction (PHP Cookbook)

#! (hash-bang) syntax, PHP scripts beginning with: 20.1. Introduction (PHP Cookbook)

# (hash marks) in comments: 2.1.4.1. Shell-style comments (Programming PHP)

- (hyphen)

indicating range of characters in character class: 10.1.2. Character Classes (JavaScript)

-- (autodecrement) operator: 2.4.7. Autoincrement and Autodecrement Operators (Programming PHP)

-- (decrement) operator: 5.3. Arithmetic Operators (JavaScript)

6.1. Expression Statements (JavaScript)
loop variables, decrementing: 6.8. for (JavaScript)
positioning in code: 2.4. Optional Semicolons (JavaScript)

- (arithmetic negation) operator: 2.4.5. Arithmetic Operators (Programming PHP)

-= (assignment) operator: 5.9.1. Assignment with Operation (JavaScript)

-= (subtraction assignment) operator: 2.4.12.2. Assignment with operation (Programming PHP)

- (subtraction) operator: 2.4.5. Arithmetic Operators (Programming PHP)

-Infinity: 3.1.5. Special Numeric Values (JavaScript)

for right-justified strings: 4.2.3.1. Format modifiers (Programming PHP)

subtraction operator: 5.3. Arithmetic Operators (JavaScript)

unary negation operator: 5.3. Arithmetic Operators (JavaScript)

-- (decrement) operator: 12.6. Operators (Dynamic HTML)

- (negation) operator: 12.6. Operators (Dynamic HTML)

- (subtraction) operator: 12.6. Operators (Dynamic HTML)

-> construct, accessing properties and methods: 2.2.6. Objects (Programming PHP)

6.3. Accessing Properties and Methods (Programming PHP)

defining character range in regular expressions: 4.8.2. Character Classes (Programming PHP)

inline pattern matching options, turning off: 4.10.9. Inline Options (Programming PHP)

~ (logical NOT): 8.16.3. Discussion (PHP Cookbook)

% (modulo) operator: 5.3. Arithmetic Operators (JavaScript)

18.3.4. DHTML Animations (JavaScript)

!== (nonidentity) operator: 4.13.3. Discussion (PHP Cookbook)

19.8.3. Discussion (PHP Cookbook)

# (number sign) Apache server configuration files: 18.1.2. Server Configuration (Webmaster in a Nutshell)

( ) (parentheses)

as pattern delimiters: 4.10.1. Delimiters (Programming PHP)

embedding comments in email addresses: 13.6.3. Discussion (PHP Cookbook)

function call operator: 5.10.8. The Function Call Operator (JavaScript)

5.10.8. The Function Call Operator (JavaScript)
6.14. function (JavaScript)

grouping characters and capturing in patterns: 13.1. Introduction (PHP Cookbook)

grouping operands for precedence: 2.4.2. Operator Precedence (Programming PHP)

grouping patterns in regular expressions: 4.8.5. Subpatterns (Programming PHP), non-capturing groups: 4.10.6. Non-Capturing Groups (Programming PHP)

in functions: 3.4. Functions (JavaScript)

functions as event handler properties: 19.1.3. Event Handlers as Properties (JavaScript)

in if statements: 6.3. if (JavaScript)

in regular expressions: 10.1.4. Alternation, Grouping, and References (JavaScript)

10.1.4. Alternation, Grouping, and References (JavaScript)

invoking functions: 3.5. Objects (JavaScript)

7.1. Defining and Invoking Functions (JavaScript)

operator evaluation order, specifying: 5.2.3. Operator Precedence (JavaScript)

JavaScript: 11.2.9. Expressions and Operators (Webmaster in a Nutshell)

11.2.12.4. Grouping and alternation (Webmaster in a Nutshell)

% (percent sign)

%= (modulus assignment) operator: 2.4.12.2. Assignment with operation (Programming PHP)

% (modulus) operator: 12.6. Operators (Dynamic HTML)

2.4.5. Arithmetic Operators (Programming PHP)

%2F sequence: 12.2. URL Encoding (Webmaster in a Nutshell)

in format string to printf( ): 4.2.3. printf( ) (Programming PHP)

SQL wildcard character: 10.10.3. Discussion (PHP Cookbook)

SSI time formats: 13.4. Configurable Time Formats for SSI Output (Webmaster in a Nutshell)

strftime( ), formatting characters preceded by: 3.5.3. Discussion (PHP Cookbook)

+ (plus sign)

+= (add-by-value) operator: 12.6. Operators (Dynamic HTML)

+= (addition assignment) operator: 2.4.12.2. Assignment with operation (Programming PHP)

+ (addition) operator: 12.6. Operators (Dynamic HTML)

2.4.5. Arithmetic Operators (Programming PHP)

+ (arithmetic assertion) operator: 2.4.5. Arithmetic Operators (Programming PHP)

+= (assignment) operator: 5.9.1. Assignment with Operation (JavaScript), appending text to innerHTML property: 17.2.4. Adding Content to a Document (JavaScript)

++ (autoincrement) operator: 2.4.7. Autoincrement and Autodecrement Operators (Programming PHP)

++ (increment) operator: 12.6. Operators (Dynamic HTML)

5.3. Arithmetic Operators (JavaScript)
5.3. Arithmetic Operators (JavaScript)
6.1. Expression Statements (JavaScript)
loop variables, incrementing: 6.8. for (JavaScript)
positioning in code: 2.4. Optional Semicolons (JavaScript)

+ operator, merging arrays: 4.8.3. Discussion (PHP Cookbook)

+ (unary plus) operator: 5.3. Arithmetic Operators (JavaScript)

addition operator: 5.2.3. Operator Precedence (JavaScript)

5.3. Arithmetic Operators (JavaScript)

converting objects in string or numeric context: 11.1.1. Object-to-Primitive Conversion (JavaScript)

in greedy and non-greedy quantifiers: 4.10.5. Quantifiers and Greed (Programming PHP)

operands, data types of: 5.2.2. Type of Operands (JavaScript)

printing positive numbers with: 4.2.3.1. Format modifiers (Programming PHP)

quantifier, in regular expressions: 10.1.3. Repetition (JavaScript)

regular expression metacharacter: 13.1. Introduction (PHP Cookbook)

spaces, encoding in URLs: 4.5.2.2. Query-string encoding (Programming PHP)

9.6. Dynamically Generated Buttons (Programming PHP)

string concatenation operator: 3.2.3. Working with Strings (JavaScript)

3.12. Primitive Data Type Wrapper Objects (JavaScript)
5.3. Arithmetic Operators (JavaScript)
5.3. Arithmetic Operators (JavaScript)
5.6. String Operators (JavaScript)
5.6. String Operators (JavaScript)
5.6. String Operators (JavaScript)

# (pound sign): 3.7.2. ID Selectors (Dynamic HTML)

? (question mark)

?: (conditional) operator: 12.6. Operators (Dynamic HTML)

5.10.1. The Conditional Operator (?:) (JavaScript)
2.4.13. Miscellaneous Operators (Programming PHP)
2.5.1. if (Programming PHP)

?: (ternary) operator: 5.3.2. Solution (PHP Cookbook)

after quantifiers, for nongreedy matching: 13.5.2. Solution (PHP Cookbook)

embedding arguments in URLs: 13.9. The Location Object (JavaScript)

in non-greedy quantifiers: 4.10.5. Quantifiers and Greed (Programming PHP)

in regular expressions: 10.1.3. Repetition (JavaScript)

placeholder in database queries: 10.8.3. Discussion (PHP Cookbook)

8.4.1. Placeholders (Programming PHP)

quantifier, in regular expressions: 10.1.3. Repetition (JavaScript)

regex extensions, ?=: 10.1.5. Specifying Match Position (JavaScript)

regular expression metacharacter: 13.1. Introduction (PHP Cookbook)

replacing characters outside target encoding: 11.3.6.1. Character encoding (Programming PHP)

@ ("at-rules"), CSS style sheets: 18.5.5. Traversing Style Sheets (JavaScript)

' (quotes, single)

escaping for SQL: 10.1. Introduction (PHP Cookbook)
HTML entity for: 4.5.1.1. Entity-quoting all special characters (Programming PHP)
in command-line arguments: 18.21.3. Discussion (PHP Cookbook)
in function return values: 6.10.3. Discussion (PHP Cookbook)
in heredocs: 4.1.4. Here Documents (Programming PHP)
in SQL queries: 4.5.3. SQL (Programming PHP)
in string literals: 2.2.3. Strings (Programming PHP), escape sequences in: 2.2.3. Strings (Programming PHP)
marking strings in queried data: 10.10.2. Solution (PHP Cookbook)
single-quoted strings: 4.1.2. Single-Quoted Strings (Programming PHP)
in strings: 1.1. Introduction (PHP Cookbook)

' (quotes, single) in strings: 3.2.1. String Literals (JavaScript)

; (semicolon): 3.6.1.2. The style attribute in element tags (Dynamic HTML)

6.3.1. Event Handlers as Tag Attributes (Dynamic HTML)

after terminating heredoc identifier: 4.1.4. Here Documents (Programming PHP)

argument separator for URLs: 8.9.3. Discussion (PHP Cookbook)

automatic insertion in JavaScript: 6.11. break (JavaScript)

before PHP closing tag: 2.1.2. Statements and Semicolons (Programming PHP)

do loop, terminating with: 6.7. do/while (JavaScript)

empty statements: 6.19. The Empty Statement (JavaScript)

end of statement character: 1.1. Introduction (PHP Cookbook)

in PHP statements: 2.1.2. Statements and Semicolons (Programming PHP)

JavaScript and CSS: 18.3.2. Working with Style Properties (JavaScript)

JavaScript statements: 11.2.3. Semicolons (Webmaster in a Nutshell)

11.2.10.3. Empty statements (Webmaster in a Nutshell)

omitting between JavaScript statements: 2.4. Optional Semicolons (JavaScript)

PHP statements: 16.2. Embedding PHP in HTML (Webmaster in a Nutshell)

separating statements with: 1.10. Exploring JavaScript (JavaScript)

2.4. Optional Semicolons (JavaScript)
6. Statements (JavaScript)

/ (slash)

/* */, in multiline C-style comments: 2.1.4.3. C comments (Programming PHP)

/** and */ in PHPDoc comments: 21.9.3. Discussion (PHP Cookbook)

// comment statement: 12.8. Miscellaneous Statements (Dynamic HTML)

/= (division assignment) operator: 2.4.12.2. Assignment with operation (Programming PHP)

/ (division) operator: 12.6. Operators (Dynamic HTML)

2.4.5. Arithmetic Operators (Programming PHP)

CGI: 12.2. URL Encoding (Webmaster in a Nutshell)

pathname separator on Unix: 19.5.3. Discussion (PHP Cookbook)

type specification modifier: 14.7. Parameter Handling (Programming PHP)

[] (square brackets), JavaScript regular expressions: 11.2.12.2. Character classes (Webmaster in a Nutshell)

@ symbol: 7.2.1.3. Validating email addresses (Web Database Applications)

7.3.1.1. Case study: A generic JavaScript validation function (Web Database Applications)

~ (tilde)

~ (bitwise NOT) operator: 12.6. Operators (Dynamic HTML)
bitwise negation operator: 2.4.9. Bitwise Operators (Programming PHP)
bitwise NOT operator: 5.8. Bitwise Operators (JavaScript)
17.5.1.2. Filtering (JavaScript)

_ (underscore): 6.3.3. Event Handlers as <script> Tags (IE 4 and Later) (Dynamic HTML)

4.4. Frame Targets (Webmaster in a Nutshell)
_ _ , method names beginning with: 6.4.1. Declaring Methods (Programming PHP)
_( ) alias for gettext( ): 16.11.3. Discussion (PHP Cookbook)
_ _FILE_ _ and _ _LINE_ _ constants: 8.18.3. Discussion (PHP Cookbook)
converting dots (.) in cookie names to: 7.6.1. Cookies (Programming PHP)
converting dots (.) in HTML field names to: 7.4.2. Parameters (Programming PHP)
replacing . (dot) in variable names: 9.10.2. Solution (PHP Cookbook)
SQL wildcard character: 10.10.3. Discussion (PHP Cookbook)

_ (underscore), in identifiers: 2.7. Identifiers (JavaScript)

| (vertical bar)

|= (bitwise OR assignment) operator: 2.4.12.2. Assignment with operation (Programming PHP)

| (bitwise OR) operator: 12.6. Operators (Dynamic HTML)

5.8. Bitwise Operators (JavaScript)
2.4.9. Bitwise Operators (Programming PHP)

|| (logical OR) operator: 5.7.2. Logical OR (||) (JavaScript)

|| (OR) operator: 12.6. Operators (Dynamic HTML)

alternation in regular expressions: 10.1.4. Alternation, Grouping, and References (JavaScript)

10.1.4. Alternation, Grouping, and References (JavaScript)

alternatives, in regular expressions: 4.8.3. Alternatives (Programming PHP)

(bitwise OR) operator: 17.5.1.2. Filtering (JavaScript)

type specification modifier: 14.7. Parameter Handling (Programming PHP)

Numbers

$1, ..., $9 property, RegExp objects: 12.5. Core Objects (Dynamic HTML)

200-299 HTTP status codes: 17.2.2. Client Request Successful (Webmaster in a Nutshell)

24-bit color: 9.3. Basic Graphics Concepts (Programming PHP)

64-bit floating-point format (numbers): 3.1. Numbers (JavaScript)

32-bit integers: 3.1.1. Integer Literals (JavaScript)

5.8. Bitwise Operators (JavaScript)

0,0 coordinate: 4.1.2. Absolute Versus Relative Positioning (Dynamic HTML)

0 (zero)

as empty variable: 5.1. Introduction (PHP Cookbook)
numbers beginning with: 3.10.3. Discussion (PHP Cookbook)
return values from functions: 6.10.3. Discussion (PHP Cookbook)
in string escape sequences: 1.1. Introduction (PHP Cookbook)

300-399 HTTP status codes: 17.2.3. Redirection (Webmaster in a Nutshell)

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