Description:
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---
From manual page: http://www.php.net/function.rewinddir
---

return type is specified as void but it is false in case of errors:

php > var_dump(rewinddir(fopen('/tmp/', 'r')));
PHP Warning:  rewinddir(): 25 is not a valid Directory resource in php shell code on line 1
PHP Stack trace:
PHP   1. {main}() php shell code:0
PHP   2. rewinddir() php shell code:1
php shell code:1:
bool(false)


Test script:
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var_dump(rewinddir(fopen('/tmp/', 'r')));