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%f formatting directive
-f httpd option, server binary
fatal errors, dividing numbers by zero
fax tables, online address books
fclose() function
feedback forms
feof() function 2nd
Fetch
fgetc() function 2nd
fgets() function 2nd
field widths (strings)
files
     $FILES superglobal
     Apache file systems, accessing
     appending
    authentication
         Authoritative directive
         backend storage
         mod auth module
         user management
     closing
     config.log
     config.status
     configuration files
         conditional containers
         Listen directive
         modifying
         parameters
         processing (MPMs)
         ServerName directive
         ServerRoot directive
     confirming
     creating
     deleting
     descriptors, operating system scalability limits
     directives, applying
     documents, adding to
     error logs 2nd
     executability
     $file array variable
     FILE command
     $file dir variable
     $file name variable
     file_exists() function
     fileatime() function
     filectime() function
     FileInfo, directive value
     filemtime() function
     <Files> directive container
     $FILES superglobal
     filesize() function
     fontwrap.php
     groups file, backend storage (file-based authentication)
     HTTP request logs
     httpd 2nd
     httpd.conf file, modifying
     include() function
    included
         containing PHP code
         returns values
     INSTALL
     last accessed date
     locking
    log files
         access log
         error log 2nd
         HTTP request logs
         paths (logname)
         scoreboard file
     memory, mapping to (Apache performance)
     modification date
     multiple test function
     names, defining (logging)
     navigating
     opening
     password files, storing (file-based authentication)
     per-directory configuration files 2nd
     php.ini 2nd
     phpinfo.php
     readability
    reading
         arbitrary data amounts
         characters 2nd
         feof() function
         fgetc() function
         fgets() function
         fread() function
         fseek() function
         lines
         using popen() function
     README
     robots.txt, Apache security
     scoreboard files 2nd
     status, checking
     structures, Apache configuration
     time, customizing
     upload forms
     upload global variables
     users, backend storage (file-based authentication)
     validation
     writability
     writing to
fills (color)
first normal forms
$firstDayArray variable
flag directives
flat tables
FLOAT data types 2nd
flock() function
flow control
     code blocks
    loops
         break statements
         continue statements
         do, while statements
         for statements
         infinite
         nesting loops
         while statement
    switching flow
         if else statements
         if elseif statements
         if statements
         switch statements
         ternary (?) operators
FLUSH command 2nd
FLUSH HOSTS command
FLUSH LOGS command
FLUSH PRIVILEGES command
FLUSH TABLES command
FollowSymLinks parameter, Options directive
fonts (text)
     fontWrap() function
     fontwrap.php file
     imageloadfont() function
     imagettftext() function
     specification
fopen() function
for statements
foreach statement
formats
     codes, date() function
     log formats, defining
     string control
formatting
     dates
     directives, logging (HTTP requests)
    strings
         argument swapping
         conversion specification 2nd
         example
         field width specifications
         format string control
         padding specifiers
         precision specifications
         printf() function
         specifiers
         storing
         type specifiers
%y formatting directive
forms
     feedback
    file upload
         creating
         global variables
         overview
         scripts, creating
    HTML, user input
         accessing from multiple SELECT elements
         receiving
    HTML/PHP combination
         hidden fields
         HTML form, calling itself
         PHP number guessing script
     raw headers
     server headers
     submission, sending mail on creating script to send
         form creation
         formatting with HTML
         mail() function
     users, redirecting
forum posts/topics (discussion tables)
forward slashes (//) 2nd
fputs() function
FQDN (fully qualified domain name) 2nd
fread() function
FreeBSD
Frequently Asked Questions
From header
fseek() function
FTP client
fully qualified domain name (FQDN) 2nd
functions [See also methods.]
     abs()
     addNums()
     arguments
         default values for
         default values for, setting
         variable reference, passing
     array keys()
     array merge()
     array push()
     array shift()
     array unshift()
     array values()
     array() 2nd
     benchmark()
     built-in
     calling
     CHAR LENGTH()
     CHARACTER LENGTH()
     checkdate
     checkdate()
     CONCAT WS() 2nd
     CONCAT()
     concatenation
     constructors and
     count()
     CURDATE()
     CURRENT DATE()
     CURRENT TIME()
     CURRENT TIMESTAMP()
     CURTIME()
     DATE ADD()
     DATE FORMAT() 2nd 3rd
     date select()
     DATE SUB
     date() 2nd
     DAYNAME()
     DAYOFMONTH()
     DAYOFWEEK()
     DAYOFYEAR
     declaring
     define()
     defineStrings()
     defining 2nd
     die()
     doDB()
     DOM, accessing XML from PHP
     each()
     echo()
     emailChecker()
     escapeshellarg()
     escapeshellcmd()
     exec(), running commands with
     existence of, testing
     explode(), breaking strings into arrays
     fclose()
     feof()
     fgetc() 2nd
     fgets()
     file_exists()
     fileatime()
     filectime()
     filemtime()
     filesize()
     flock()
     fontWrap
     fopen()
     fputs()
     fread()
     fseek()
     function exists()
     fwrite()
     getdate() 2nd 3rd 4th
     gettype()
     getYearEnd()
     getYearStart()
     gmdate()
     header()
         cookies, setting
         forms
         raw headers
     HOUR()
     ImageArce()
     ImageColorAllocate()
     ImageCreate()
     ImageCreateFromGif()
     ImageCreateFromJpg()
     ImageCreateFromPng()
     ImageDestroy()
     ImageEllipse()
     ImageFilledArc()
     ImageFilledEllipse()
     ImageFilledPolygon()
     ImageFilledRectangle()
     ImageGif()
     ImageJpeg()
     ImageLine()
     imageloadfont()
     ImagePng()
     ImagePolygon()
     ImageRectangle()
     imagestring() 2nd
     imagettftext()
     include once()
    include()
         example listing
         executing PHP/assign return values
         files
         include once() function
         include path directive
         loops
         within control structures
     is uploaded file()
     is_dir()
     is_executable()
     is_file() 2nd
     is_readable()
     is_writable()
     isset()
     LCASE()
     LEFT()
     length
     LENGTH()
     list()
     LOCATE()
     location and position
     LPAD()
     ltrim() 2nd
     mail() 2nd 3rd
     mbstring
     MINUTE()
     mkdir()
     mktime() 2nd 3rd
     month select()
     MONTH()
     MONTHNAME()
     move uploaded file()
     multiple file tests output
     mysql connect error()
     mysql insert id() 2nd
     mysql result()
     MySQL, accessing list of
     mysqli *
     mysqli close()
     mysqli error()
     mysqli fetch array()
     mysqli num rows()
     mysqli query()
     n12br(), wrapping text
     naming rules
     NOW() 2nd
     numberedHeading()
     OCTET LENGTH()
     opendir()
     output()
     padding
     passthru(), running commands with
     password()
     phpinfo()
     popen()
     print() 2nd
     printBR()
     printf(), strings
     readdir()
     REPEAT()
     REPLACE()
     require once()
     require()
     reset()
     RIGHT()
     rmdir()
     RPAD()
     RTRIM() 2nd
     SECOND()
     SECT TO TIME()
     serialize()
     session start() 2nd 3rd
     session_destroy()
     session_id() 2nd
     session_save_path()
     session_start()
     set time limit()
     setcookie()
     setDate array()
     setDate global()
     settype()
     setYearEnd()
     setYearStart()
     shuffle()
     SimpleXML, accessing XML from PHP
     sizeof()
     sprintf() 2nd
     state, saving between calls
     statements
     str replace(), replacing strings
     string modification
     strip tags()
     stripslashes() 2nd 3rd
     strlen()
     strpos()
     strstr()
     strtok()
     strtolower()
     strtoupper()
     substr()
     substr_replace(), replacing string portions
     SUBSTRING()
     system(), running commands with
     tagWrap()
     test()
     TIME FORMAT()
     TIME TO SEC()
     time() 2nd
     touch(), file creation
     TRIM() 2nd
     UCASE()
     ucwords()
     underline()
     UNIX TIMESTAMP()
     unlink(), file deletion
     user-defined
     values, returning
    variables
         accessing
         global variables, changing within functions
         scope
     WEEKDAY()
     wordwrap(), wrapping text
     year select()
     YEAR()