Note: 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 '$var is not set at all';
}
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Note that this is meaningless when used on anything which isn't a variable; i.e. empty (addslashes ($name)) has no meaning since it would be checking whether something which isn't a variable is a variable with a FALSE value.