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UnsupportedPropertyReferenceUsage

docs/running_psalm/issues/UnsupportedPropertyReferenceUsage.md

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UnsupportedPropertyReferenceUsage

Psalm cannot guarantee the soundness of code that uses references to properties.

Examples of Uncaught Errors

  • Instance property assigned wrong type:
php
<?php
class A {
    public int $b = 0;
}
$a = new A();
$b = &$a->b;
$b = ''; // Fatal error
  • Static property assigned wrong type:
php
<?php
class A {
    public static int $b = 0;
}
$b = &A::$b;
$b = ''; // Fatal error
  • Readonly property reassigned:
php
<?php
class A {
    public function __construct(
        public readonly int $b,
    ) {
    }
}
$a = new A(0);
$b = &$a->b;
$b = 1; // Fatal error