_{Official ZPE/YASS documentation}Empty

The ZPE empty feature is used to determine if a string, list, map or object has no characters, elements, keys or properties, respectively. The empty expression was added in ZPE 1.11.9.

Much like the count expression, whilst it looks like a built-in function, it is actually not and the underlying implementation is very different. By having the a different implementation, it actually runs faster too.

Using empty

To use it, write it like a function:

$a = empty("Hello world")
print($a)
$b = empty([])
print($b)
$c = empty([=>])
print($c)
$d = empty({})
print($d)