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```php
find ( string $selector [, int $idx = null [, bool $lowercase = false ]] ) : mixed
```

Finds elements in the DOM.

| Parameter   | Description                                      |
|-------------|--------------------------------------------------|
| `selector`  | A [CSS style selector](../HtmlNode/find.md).     |
| `idx`       | Index of the element to return.                  |
| `lowercase` | Matches tag names case insensitive when enabled. |

Returns an array of matches or a single element if `idx` is defined.