Index[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] validating data types 2nd dates 2nd email addresses 2nd HTML forms mandatory fields 2nd 3rd 4th selection lists 2nd 3rd passwords 2nd 3rd usernames 2nd 3rd XML 2nd var_dump() function var_export() function variables checking data type of 2nd converting arrays into 2nd 3rd information about, getting 2nd printing 2nd vprintf() function vsprintf() function |