wireEmpty() function

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.

Please note this method is and thus not intended to be called directly.

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

Internal 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 3.0.251