arrayUnpacking.nonIterable

Code example

<?php declare(strict_types = 1);

$value = 'hello';

$array = [...$value];

Why is it reported?

The spread operator (...) is used to unpack a value inside an array literal, but the value being unpacked is not iterable. Only arrays and Traversable objects can be unpacked in this context. PHP will throw a TypeError at runtime if a non-iterable value is unpacked.

In the example above, a string is being unpacked, which is not iterable.

How to fix it

Ensure the value being unpacked is an array or iterable:

 <?php declare(strict_types = 1);

-$value = 'hello';
+$value = ['h', 'e', 'l', 'l', 'o'];

 $array = [...$value];

Or wrap it in an array if you want to include it as a single element:

 <?php declare(strict_types = 1);

 $value = 'hello';

-$array = [...$value];
+$array = [$value];