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psalm/docs/running_psalm/issues/MethodSignatureMismatch.md

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# MethodSignatureMismatch
Emitted when a method parameter differs from a parent method parameter, or if there are fewer parameters than the parent method
```php
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<?php
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class A {
public function foo(int $i) : void {}
}
class B extends A {
public function foo(string $i) : void {}
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}
```