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[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] false (truth value)      negation operator and      return values of functions      validating form elements  fatal errors  fbsql (db_program option)  fclose( )      checking for errors from  feof( )  fetch mode  fetchRow( )      changing format of retrieved rows      retrieving data from database  fgetcsv( )      checking for errors from  fgets( )      checking for errors from  _ _FILE_ _ special constant  file_exists( )  file_get_contents( )  2nd      checking for errors from      sanitizing externally supplied filenames  file_put_contents( )      checking for errors from      return values for  file_uploads configuration directive  2nd  files      CSV      error checking in      escaping special characters      permissions         inspecting          understanding      reading         entire file          parts of      sanitizing externally supplied names      writing         entire file          parts of  Fitzgerald, Michael  Flash movies in PHP programs  floating-point numbers      arithmetic operators and      checking for, in forms      comparing      formatting rules for      truth values of  floatval( )  fopen( )      checking for errors from      modes for  for( ) loop  2nd      looping through multidimensional arrays      multidimensional numeric arrays and      numeric arrays and  foreach( ) loop      debugging programs      looping through arrays with      looping through multidimensional arrays      printing web session data and  form data     code example  2nd      floating-point numbers, checking for      inserting safely      integers, checking for      number ranges in      processing      required elements, checking      retrieving safely      sanitizing         externally supplied filenames          externally supplied form input      saving in a session      submitting      uploading files in forms      validating  form helper functions  formatted date or time strings  formatted numbers, printing  formatting strings  forms      default values, displaying      displaying      error messages, displaying  2nd      multidimensional array syntax, using in      parameters         accessing          hidden      processing with functions  Friedl, Jeffrey E.F.  2nd  FrontBase PHP extension  function keyword  functions      calling      declaring      form processing with      global vs. local variables      helper functions  2nd      multiple return statements in      passing arguments to      return values of      returning arrays from      returning values from  fwrite( )      checking for errors from      CSV files, working with      return values for

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