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%l format string option (DATE FORMAT() function)
%l formatting directive
-l httpd option, server binary
LANGCODE variable
LCASE() function
LDAP (Lightweight Directory Access Protocol), user management
leading spaces, padding output with
LEFT JOIN command
LEFT() function
length functions
less than operators (>) 2nd
less than or equal to operators (>=) 2nd
level errors, logging (LogLevel directive)
lib directory 2nd
libraries
     calendar example
     GD
     JPEG, image creation
    OpenSSL, installing
         UNIX
         Windows, installing (SSL installs)
     PNG, image creation
     SSLeay
     zlib, image creation
LIKE operators
<Limit> container, limiting HTTP method access
LIMIT command
Limit directive value
<LimitExcept> container, limiting HTTP method access
LimitRequestBody directive, Apache performance
LimitRequestFields directive, Apache performance
LimitRequestFieldSize directive, Apache performance
LimitRequestLine directive, Apache performance
LimitXMLRequestBody directive, Apache performance
lines, drawing
Linux
    Apache
         installs 2nd
         startups
     distribution CDs
     mod_ssl Apache modules
     MySQL, installing 2nd
     OpenSSL library, installing
    PHP
         installing 2nd 3rd
         integrating with Apache
     server processes, operating system scalability limits
list() function, arrays
Listen directive 2nd
listening addresses (Listen directive)
listings
     abs() function
    access
         reports, creating
         restricting
    arguments
         Allow, Deny argument
         passing by value
    authentication
         access control rules and
         file-based
    calendar
         display script
         example 2nd
         HTML form
         library, creating
         user input, checking
    commands, running
         using passthru() function
         with exec() function
     constants, accessing/defining
    cookies
         auth cookies
         setting/printing
     date formatting
     Deny, Allow argument
     directories, listing contents of
    files
         navigating
         opening/reading line by line
         popen() function, passing data
         reading by characters
         reading in chunks
         writing to
    functions
         existence of, testing
         multiple file tests output
     global variables
     HTML forms
     HTML/PHP combination forms
    images
         color fills
         existing images, creating from
         new images, creating
         pie charts
         transparent
         user input, creating from
     include() function
     included file with PHP code
     localization, Web page structure
     login form
     menus, address book example
    objects
         inheritance
         methods
         properties
     PHP script with HTML
     popen() function, reading files
     raw headers (forms)
     server headers (forms)
     ServerAlias directive
    session variables
         accessing
         array variables, adding to
         multiple, registering
         stored variables
     strings, formatting
     tables, storefront database table example
     time stamps
     type specifiers
     user login script
    variables
         casting
         session
         testing type of
lists (user), Require directive
Liyanage, Marc
ln command, symbolic links (symlink)
load distribution (Apache performance)
load testing, ApacheBench (ab) performance tool 2nd
LoadModule directive, SSL configurations
local variables
local7 syslog daemon, logging errors
localization
     character sets
    environment modifications
         Apache, configuration changes to
         MySQL, configuration changes to
         PHP, configuration changes to
     internationalization
     overview
     Web page structure
LOCATE() function
<Location> directive container
location function
lock screen mechanism
locking files
logical operators 2nd
login forms
logs
     analyzing
     Common Log Format (CLF)
     conditional
    custom, database tables
         code snippet
         sample reports
    directives
         LogFormat
         LogLevel
         status codes
     error logs
     formatting directives (HTTP requests)
     HTTP requests
     images
    log files
         Apache
         logname paths
     logresolve.exe utility, resolving hostnames
     Logscan
     Logtools
     managing
     merging
     request logs
     rotating
     splitting
LONGBLOB data type
LONGTEXT data type
loops [See also statements.]
     break statements
     conditional
     continue statements
     do, while statements
     for statements
     infinite
     iteration
     iterations, skipping
     nesting
     while statements
LPAD() function
ltrim() function 2nd