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393 B
393 B
ImpureByReferenceAssignment
Emitted when assigning a passed-by-reference variable inside a function or method marked as mutation-free.
<?php
/**
* @psalm-pure
*/
function foo(string &$a): string {
$a = "B";
return $a;
}
How to fix
Just remove the mutating assignment:
<?php
/**
* @psalm-pure
*/
function foo(string &$a): string {
return $a;
}