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# A better PHP backtrace [](https://packagist.org/packages/spatie/backtrace)  [](https://packagist.org/packages/spatie/backtrace) 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(); ``` #### Reducing arguments For viewing purposes, arguments can be reduced to a string: ```php $backtrace = Spatie\Backtrace\Backtrace::create()->withArguments()->reduceArguments(); ``` By default, some typical types will be reduced to a string. You can define your own reduction algorithm per type by implementing an `ArgumentReducer`: ```php class DateTimeWithOtherFormatArgumentReducer implements ArgumentReducer { public function execute($argument): ReducedArgumentContract { if (! $argument instanceof DateTimeInterface) { return UnReducedArgument::create(); } return new ReducedArgument( $argument->format('d/m/y H:i'), get_class($argument), ); } } ``` This is a copy of the built-in argument reducer for `DateTimeInterface` where we've updated the format. An `UnReducedArgument` object is returned when the argument is not of the expected type. A `ReducedArgument` object is returned with the reduced value of the argument and the original type of the argument. The reducer can be used as such: ```php $backtrace = Spatie\Backtrace\Backtrace::create()->withArguments()->reduceArguments( Spatie\Backtrace\Arguments\ArgumentReducers::default([ new DateTimeWithOtherFormatArgumentReducer() ]) ); ``` Which will first execute the new reducer and then the default ones. ### 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.