# Getting started

After [installation](https://altophp.com/code-snippet/installation.md), save this as `snippet.php` beside
`vendor/`. It creates a snippet that starts on line 24 of its original file,
then selects its third line. The package does not read that file; the source
name is metadata.

```php
<?php

require __DIR__.'/vendor/autoload.php';

use Alto\Code\Snippet\CodeSnippet;

$snippet = CodeSnippet::fromCode(
    "public function run(): void\n{\n    execute();\n}",
    'php',
    sourceName: 'src/Runner.php',
    startLine: 24,
)->selectLines(3);

$line = $snippet->lines()[2];
printf(
    "index=%d number=%d selected=%s\n",
    $line->index,
    $line->number,
    $line->selected ? 'true' : 'false',
);
echo $line->code, "\n";
```

Run `php snippet.php`. The output is:

```text
index=3 number=26 selected=true
    execute();
```

`selectLines()` uses one-based positions inside the snippet. Selection marks a
line; it does not remove the other lines or define a visual effect. Continue
with the [usage guide](https://altophp.com/code-snippet/usage.md) to annotate, slice, indent, and export snippets.