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# A better PHP backtrace

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![Tests](https://github.com/spatie/backtrace/workflows/Tests/badge.svg)

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To get the backtrace in PHP you can use the `debug_backtrace` function. By default, it can be hard to work with. The

reported function name for a frame is skewed: it belongs to the previous frame. Also, options need to be passed using a bitmask.

This package provides a better way than `debug_backtrace` to work with a back trace. Here's an example:

```php

// returns an array with `Spatie\Backtrace\Frame` instances

$frames = Spatie\Backtrace\Backtrace::create()->frames();

$firstFrame = $frames[0];

$firstFrame->file; // returns the file name

$firstFrame->lineNumber; // returns the line number

$firstFrame->class; // returns the class name

```

## Support us

[<img src="https://github-ads.s3.eu-central-1.amazonaws.com/backtrace.jpg?t=1" width="419px" />](https://spatie.be/github-ad-click/backtrace)

We invest a lot of resources into creating [best in class open source packages](https://spatie.be/open-source). You can

support us by [buying one of our paid products](https://spatie.be/open-source/support-us).

We highly appreciate you sending us a postcard from your hometown, mentioning which of our package(s) you are using.

You'll find our address on [our contact page](https://spatie.be/about-us). We publish all received postcards

on [our virtual postcard wall](https://spatie.be/open-source/postcards).

## Installation

You can install the package via composer:

```bash

composer require spatie/backtrace

```

## Usage

This is how you can create a backtrace instance:

```php

$backtrace = Spatie\Backtrace\Backtrace::create();

```

### Getting the frames

To get all the frames you can call `frames`.

```php

$frames = $backtrace->frames(); // contains an array with `Spatie\Backtrace\Frame` instances

```

A `Spatie\Backtrace\Frame` has these properties:

- `file`: the name of the file

- `lineNumber`: the line number

- `arguments`: the arguments used for this frame. Will be `null` if `withArguments` was not used.

- `class`: the class name for this frame. Will be `null` if the frame concerns a function.

- `method`: the method used in this frame

- `applicationFrame`: contains `true` is this frame belongs to your application, and `false` if it belongs to a file in

  the vendor directory

### Collecting arguments

For performance reasons, the frames of the back trace will not contain the arguments of the called functions. If you

want to add those use the `withArguments` method.

```php

$backtrace = Spatie\Backtrace\Backtrace::create()->withArguments();

```

### Setting the application path

You can use the `applicationPath` to pass the base path of your app. This value will be used to determine whether a

frame is an application frame, or a vendor frame. Here's an example using a Laravel specific function.

```php

$backtrace = Spatie\Backtrace\Backtrace::create()->applicationPath(base_path());

```

### Getting a certain part of a trace

If you only want to have the frames starting from a particular frame in the backtrace you can use

the `startingFromFrame` method:

```php

use Spatie\Backtrace\Backtrace;

use Spatie\Backtrace\Frame;

$frames = Backtrace::create()

    ->startingFromFrame(function (Frame $frame) {

        return $frame->class === MyClass::class;

    })

    ->frames();

```

With this code, all frames before the frame that concerns `MyClass` will have been filtered out.

Alternatively, you can use the `offset` method, which will skip the given number of frames. In this example the first 2 frames will not end up in `$frames`.

```php

$frames = Spatie\Backtrace\Backtrace::create()

    ->offset(2)

    ->frames();

```

### Limiting the number of frames

To only get a specific number of frames use the `limit` function. In this example, we'll only get the first two frames.

```php

$frames = Spatie\Backtrace\Backtrace::create()

    ->limit(2)

    ->frames();

```

###  Getting a backtrace for a throwable

Here's how you can get a backtrace for a throwable.

```php

$frames = Spatie\Backtrace\Backtrace::createForThrowable($throwable)

```

Because we will use the backtrace that is already available the throwable, the frames will always contain the arguments used.

## Testing

``` bash

composer test

```

## Changelog

Please see [CHANGELOG](CHANGELOG.md) for more information on what has changed recently.

## Contributing

Please see [CONTRIBUTING](https://github.com/spatie/.github/blob/main/CONTRIBUTING.md) for details.

## Security Vulnerabilities

Please review [our security policy](../../security/policy) on how to report security vulnerabilities.

## Credits

- [Freek Van de Herten](https://github.com/freekmurze)

- [All Contributors](../../contributors)

## License

The MIT License (MIT). Please see [License File](LICENSE.md) for more information.