Error Identifier: property.nameNotString
Every error reported by PHPStan has an error identifier. Here’s a list of all error identifiers. In PHPStan Pro you can see the error identifier next to each error and filter errors by their identifiers.
Code example #
<?php declare(strict_types = 1);
class Foo
{
public string $bar = 'hello';
}
function doFoo(Foo $foo): void
{
$name = 123;
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 and cannot be converted to a string (for example, an integer, array, or object without __toString()), the property access is invalid and will produce unexpected behavior or errors at runtime.
In the example above, the variable $name is an integer (123), which is not a valid property name.
How to fix it #
Ensure the dynamic property name is a string:
<?php declare(strict_types = 1);
function doFoo(Foo $foo): void
{
- $name = 123;
+ $name = 'bar';
echo $foo->$name;
}
Or use a direct property access if the property name is known:
<?php declare(strict_types = 1);
function doFoo(Foo $foo): void
{
- $name = 123;
- echo $foo->$name;
+ echo $foo->bar;
}
How to ignore this error #
You can use the identifier property.nameNotString to ignore this error using a comment:
// @phpstan-ignore property.nameNotString
codeThatProducesTheError();You can also use only the identifier key to ignore all errors of the same type in your configuration file in the ignoreErrors parameter:
parameters:
ignoreErrors:
-
identifier: property.nameNotString