PHP 忒聊
綴豖
ヶ輛
empty
(PHP 3, PHP 4)
Description
蛁: empty() is a language construct.
This is the opposite of (boolean) var, except that no warning is generated when the variable is not set. See converting to boolean for more information.
$var = 0; if (empty($var)) {// evaluates true echo '$var is either 0 or not set at all';} if (!isset($var)) {// evaluates false echo '$var is not set at all';}
Note that this is meaningless when used on anything which isn't a variable; i.e. empty (addslashes ($name)) has no meaning since it would be checking whether something which isn't a variable is a variable with a FALSE value.
See also isset() and unset().
綴豖
れ萸
ヶ輛
doubleval
奻珨撰
floatval