File "getElementsById.md"

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```php
getElementsById ( string $id [, int $idx = null] ) : mixed
```

| Parameter | Description                 |
|-----------|-----------------------------|
| `id`      | Element id.                 |
| `idx`     | Index of element to return. |

Returns all elements with the specified id if `$idx` is null, or a specific one if `$idx` is a valid index.