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psalm/docs/running_psalm/issues/PossiblyFalseArgument.md

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# PossiblyFalseArgument
Emitted when a function argument is possibly `false`, but the function does not expect `false`. This is distinct from a function argument is possibly `bool`, which results in `PossiblyInvalidArgument`.
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```php
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<?php
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function foo(string $s) : void {
$a_pos = strpos($s, "a");
echo substr($s, $a_pos);
}
```