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psalm/docs/running_psalm/issues/ForbiddenCode.md

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# ForbiddenCode
Emitted when Psalm encounters a var_dump, exec or similar expression that may make your code more vulnerable
```php
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<?php
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var_dump("bah");
```
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This functions list can be extended by configuring `forbiddenFunctions` in `psalm.xml`
```xml
<?xml version="1.0"?>
<psalm>
<!-- other configs -->
<forbiddenFunctions>
<function name="dd"/>
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<function name="var_dump"/>
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</forbiddenFunctions>
</psalm>
```