property.nameNotString

Code example

<?php declare(strict_types = 1);

class Foo
{
	public string $bar = "hello";
}

function doFoo(Foo $foo): void
{
	$name = ["bar"];
	echo $foo->$name;
}

Why is it reported?

When accessing an object property dynamically using the $obj->$name syntax, the $name expression must evaluate to a string. If the value used as the property name is not a string (for example, an array or object), the property access is invalid and will produce unexpected behavior or errors at runtime.

In the example above, the variable $name is an array (["bar"]), which is not a valid property name.

How to fix it

Ensure the dynamic property name is a string:

 function doFoo(Foo $foo): void
 {
-	$name = ["bar"];
+	$name = "bar";
 	echo $foo->$name;
 }

Or use a direct property access if the property name is known:

 function doFoo(Foo $foo): void
 {
-	$name = ["bar"];
-	echo $foo->$name;
+	echo $foo->bar;
 }