Is the given value empty according to ProcessWire standards?
This works the same as PHP’s empty() function except for the following:
- It returns true for Countable objects that have 0 items.
- It considers whitespace-only strings to be empty.
- It considers WireNull objects (like NullPage or any others) to be empty (3.0.149+).
- It uses the string value of objects that can be typecast strings (3.0.150+).
- You cannot pass it an undefined variable without triggering a PHP warning.
Available since version 3.0.143.
Example
// behavior with Countable objects
$a = new WireArray();
empty($a); // PHP’s function returns false
wireEmpty($a); // PW’s function returns true
$a->add('item');
wireEmpty($a); // returns false, since there is now an item
// behavior with whitespace-only string
$s = ' ';
empty($s); // PHP’s function returns false
wireEmpty($s); // PW’s function returns true
// behavior with undefined variable $v
isset($v); // returns false
empty($v); // returns true
wireEmpty($v); // returns true but with PHP’s warning triggered Usage
$bool = wireEmpty (mixed $value);Arguments
| Name | Type(s) | Description |
|---|---|---|
value | mixed | Value to test if empty |
Return value
bool
Functions methods and properties
API reference based on ProcessWire core version 3.0.248