offsetAccess.nonOffsetAccessible

Code example

<?php declare(strict_types = 1);

function doFoo(int $value): void
{
	echo $value[42];
}

Why is it reported?

The code attempts to use array access syntax ($var[...] or $var[]) on a type that does not support offset access. Types like int, float, bool, resource, stdClass, and Closure do not support the [] operator.

Only arrays, strings, and objects implementing ArrayAccess support offset access in PHP.

How to fix it

Fix the type of the variable so it supports offset access:

-function doFoo(int $value): void
+function doFoo(array $value): void
 {
 	echo $value[42];
 }

Or fix the access to use a method appropriate for the type:

 function doFoo(stdClass $value): void
 {
-	echo $value['foo'];
+	echo $value->foo;
 }

If the variable might or might not be an array, narrow the type before accessing it:

<?php declare(strict_types = 1);

function doFoo(array|int $value): void
{
	if (is_array($value)) {
		echo $value[42];
	}
}