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Index: U

uasort( ) function: 5.8.1. Sorting One Array at a Time
A.3d. Alphabetical Listing of PHP Functions (r-z)
ucfirst( ) function: 4.4.2. Changing Case
A.3d. Alphabetical Listing of PHP Functions (r-z)
ucwords( ) function: 4.4.2. Changing Case
A.3d. Alphabetical Listing of PHP Functions (r-z)
uksort( ) function: 5.8.1. Sorting One Array at a Time
A.3d. Alphabetical Listing of PHP Functions (r-z)
umask( ) function: 12.4.1. Get It Right the First Time
A.3d. Alphabetical Listing of PHP Functions (r-z)
unary operators: 2.4.1. Number of Operands
- (arithmetic negation) operator: 2.4.5. Arithmetic Operators
autoincrement and autodecrement: 2.4.7. Autoincrement and Autodecrement Operators
uncompressing and extracting PHP and Apache distributions: 1.3. Installing PHP
underlining text in PDF files: 10.3.3. Text Attributes
Unicode
character encodings supported by XML parser: 11.3.6.1. Character encoding
FriBiDi extension, reordering strings for encoded character set: B.1. Optional Extensions Listing
union of two sets: 5.10.1. Sets
uniqid( ) function: A.3d. Alphabetical Listing of PHP Functions (r-z)
Unix
installing PHP: 1.3. Installing PHP
locale system in POSIX-style regular expressions: 4.9. POSIX-Style Regular Expressions
protocol for databases: 8.3.1. Data Source Names
shell scripting languages, comments in: 2.1.4.1. Shell-style comments
writing portable PHP code for: 15.2. Writing Portable Code for Windows and Unix
determining the platform: 15.2.1. Determining the Platform
end-of-file handling: 15.2.8. End-of-File Handling
end-of-line handling: 15.2.7. End-of-Line Handling
environment information: 15.2.3. The Environment
extensions: 15.2.10. Common Platform-Specific Extensions
paths, handling: 15.2.2. Handling Paths Across Platforms
remote files: 15.2.6. Remote Files
sending mail: 15.2.4. Sending Mail
server-specific functions: 15.2.5. Server-Specific Functions
shell commands: 15.2.9. External Commands
unlink( ) function: 3.1. Calling a Function
A.3d. Alphabetical Listing of PHP Functions (r-z)
unpack( ) function: A.3d. Alphabetical Listing of PHP Functions (r-z)
unpacking Apache and PHP source distributions: 1.3. Installing PHP
unparsed XML entities: 11.3.4. Entity Handlers
unregister_tick_function( ) function: A.3d. Alphabetical Listing of PHP Functions (r-z)
unserialize( ) function: A.3d. Alphabetical Listing of PHP Functions (r-z)
unset( ) function: 2.3.4. Garbage Collection
A.3d. Alphabetical Listing of PHP Functions (r-z)
uploaded files
information about: 7.2. Variables
moving: A.2c. Alphabetical Listing of PHP Functions (j-q)
uploading files: 7.4.8. File Uploads
security and: 12.3. File Uploads
distrusting browser-supplied filenames: 12.3.1. Distrust Browser-Supplied Filenames
URL rewriting, storing state information: 7.6. Maintaining State
urldecode( ) function: 4.5.2.2. Query-string encoding
urlencode( ) function: 4.5.2.2. Query-string encoding
9.6. Dynamically Generated Buttons
A.3d. Alphabetical Listing of PHP Functions (r-z)
URLs
decomposing (parse_url( ) function): 4.7.4.4. Decomposing URLs
encoding/decoding: A.3d. Alphabetical Listing of PHP Functions (r-z)
encoding/decoding strings as: 4.5.2. URLs
button strings: 9.6. Dynamically Generated Buttons
extracting from HTML page: 4.10.13.1. Matching
functions for: A.1. PHP Functions by Category
GET and POST requests: 7.4.1. Methods
https\://: 7.7. SSL
opening remotely with PHP functions, security risks of: 12.2. Filenames
parse_url( ) function: A.2c. Alphabetical Listing of PHP Functions (j-q)
session IDS, passing via: 7.6.2.2. Alternatives to cookies
US-ASCII (see ASCII)
User-Agent headers: 7.1. HTTP Basics
user-defined functions: 3.1. Calling a Function
sorting arrays with: A.3d. Alphabetical Listing of PHP Functions (r-z)
A.3d. Alphabetical Listing of PHP Functions (r-z)
user-defined order, sorting arrays in: 5.8.1. Sorting One Array at a Time
5.8.1. Sorting One Array at a Time
user_error( ) function: A.3d. Alphabetical Listing of PHP Functions (r-z)
usernames
authenticating: 7.5.4. Authentication
current, for PHP script executing: A.2b. Alphabetical Listing of PHP Functions (f-i)
security problems with: 12.2. Filenames
usleep( ) function: A.3d. Alphabetical Listing of PHP Functions (r-z)
usort( ) function: 5.8.1. Sorting One Array at a Time
A.3d. Alphabetical Listing of PHP Functions (r-z)
anonymous function, using with: 3.7. Anonymous Functions
UTF-8 character encoding: 11.3.6.1. Character encoding
printing high-bit ASCII characters: 9.5.2. TrueType Fonts

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