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] validate( ) method validate_form( ) validating forms checkboxes credit cards dates and times drop-down menus email addresses and numbers radio buttons required fields var property var_dump( ) variable-length text fields, processing variables == vs. = checking for numbers default values, establishing dumping contents as strings dynamic variable names empty, checking encapsulating complex data types as strings remote sharing between processes static, using temporary variables, exchanging values of verbs (HTTP) vertical bar (|) video MIME type |