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psalm/docs/security_analysis/avoiding_false_negatives.md
Oliver Hader 546283b71a
Update documentation for taints and global configuration (#5098)
* [DOCS] Extend documentation on global variables configuration

* [DOCS] Synchronize meaning of @psalm-taint-source input with source code

* [DOCS] Add documentation for conditional @psalm-taint-escape

* [DOCS] Add documentation for @psalm-taint-unescape
2021-01-25 11:04:00 -05:00

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# Avoiding false-negatives
## Unescaping statements
Post-processing previously escaped/encoded statements can cause insecure scenarios.
`@psalm-taint-unescape <taint-type>` allows to declare those components insecure explicitly.
```php
<?php
/**
* @psalm-taint-unescape html
*/
function decode(string $str): string
{
return str_replace(
['&lt;', '&gt;', '&quot;', '&apos;'],
['<', '>', '"', '"'],
$str
);
}
$safe = htmlspecialchars($_GET['text']);
echo decode($safe);
```