(PHP 4, PHP 5)
empty — Determine whether a variable is empty
Determine whether a variable is considered to be empty.
Variable to be checked
Note: empty() only checks variables as anything else will result in a parse error. In other words, the following will not work: empty(trim($name)).
empty() is the opposite of (boolean) var, except that no warning is generated when the variable is not set.
Returns FALSE if var has a non-empty and non-zero value.
The following things are considered to be empty:
As of PHP 5, objects with no properties are no longer considered empty.
As of PHP 4, The string value "0" is considered empty.
Example #1 A simple empty() / isset() comparison.
<?php$var = 0;// Evaluates to true because $var is emptyif (empty($var)) { echo '$var is either 0, empty, or not set at all';}// Evaluates as true because $var is setif (isset($var)) { echo '$var is set even though it is empty';}?>
Note: Because this is a language construct and not a function, it cannot be called using variable functions
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