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psalm/docs/running_psalm/issues/PropertyNotSetInConstructor.md
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# PropertyNotSetInConstructor
Uninitialized properties are hard to statically analyze. To prevent mistakes, Psalm will enforce that all properties should be initialized.
It does that through [MissingConstructor](./MissingConstructor.md) and this issue.
Psalm will then assume every property in the codebase is initialized.
Doing that allows it to report missing initializations as well as [RedundantPropertyInitializationCheck](./RedundantPropertyInitializationCheck.md)
This issue is emitted when a non-null property without a default value is declared but not set in the classs constructor
If your project relies on having uninitialized properties, it is advised to suppress this issue, as well as [MissingConstructor](./MissingConstructor.md) and [RedundantPropertyInitializationCheck](./RedundantPropertyInitializationCheck.md).
```php
<?php
class A {
/** @var string */
public $foo;
public function __construct() {}
}
```