148 lines
5.2 KiB
Markdown
148 lines
5.2 KiB
Markdown
[](https://github.com/sirn-se/phrity-util-errorhandler/actions)
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[](https://coveralls.io/github/sirn-se/phrity-util-errorhandler?branch=main)
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# Error Handler utility
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The PHP [error handling](https://www.php.net/manual/en/book.errorfunc.php) can be somewhat of a headache.
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Typically an application uses a system level [error handler](https://www.php.net/manual/en/function.set-error-handler.php) and/or suppressing errors using the `@` prefix.
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But those cases when your code need to act on triggered errors are more tricky.
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This library provides two convenience methods to handle errors on code blocks, either by throwing exceptions or running callback code when an error occurs.
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Current version supports PHP `^7.2|^8.0`.
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## Installation
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Install with [Composer](https://getcomposer.org/);
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```
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composer require phrity/util-errorhandler
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```
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## The Error Handler
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The class provides two main methods; `with()` and `withAll()`.
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The difference is that `with()` will act immediately on an error and abort further code execution, while `withAll()` will attempt to execute the entire code block before acting on errors that occurred.
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### Throwing ErrorException
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```php
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use Phrity\Util\ErrorHandler;
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$handler = new ErrorHandler();
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$result = $handler->with(function () {
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// Code to execute
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return $success_result;
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});
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$result = $handler->withAll(function () {
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// Code to execute
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return $success_result;
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});
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```
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The examples above will run the callback code, but if an error occurs it will throw an [ErrorException](https://www.php.net/manual/en/class.errorexception.php).
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Error message and severity will be that of the triggering error.
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* `with()` will throw immediately when occured
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* `withAll()` will throw when code is complete; if more than one error occurred, the first will be thrown
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### Throwing specified Throwable
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```php
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use Phrity\Util\ErrorHandler;
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$handler = new ErrorHandler();
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$result = $handler->with(function () {
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// Code to execute
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return $success_result;
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}, new RuntimeException('A specified error'));
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$result = $handler->withAll(function () {
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// Code to execute
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return $success_result;
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}, new RuntimeException('A specified error'));
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```
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The examples above will run the callback code, but if an error occurs it will throw provided Throwable.
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The thrown Throwable will have an [ErrorException](https://www.php.net/manual/en/class.errorexception.php) attached as `$previous`.
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* `with()` will throw immediately when occured
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* `withAll()` will throw when code is complete; if more than one error occurred, the first will be thrown
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### Using callback
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```php
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use Phrity\Util\ErrorHandler;
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$handler = new ErrorHandler();
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$result = $handler->with(function () {
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// Code to execute
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return $success_result;
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}, function (ErrorException $error) {
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// Code to handle error
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return $error_result;
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});
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$result = $handler->withAll(function () {
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// Code to execute
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return $success_result;
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}, function (array $errors, $success_result) {
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// Code to handle errors
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return $error_result;
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});
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```
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The examples above will run the callback code, but if an error occurs it will call the error callback as well.
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* `with()` will run the error callback immediately when error occured; error callback expects an ErrorException instance
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* `withAll()` will run the error callback when code is complete; error callback expects an array of ErrorException and the returned result of code callback
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### Filtering error types
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Both `with()` and `withAll()` accepts error level(s) as last parameter.
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```php
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use Phrity\Util\ErrorHandler;
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$handler = new ErrorHandler();
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$result = $handler->with(function () {
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// Code to execute
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return $success_result;
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}, null, E_USER_ERROR);
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$result = $handler->withAll(function () {
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// Code to execute
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return $success_result;
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}, null, E_USER_ERROR & E_USER_WARNING);
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```
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Any value or combination of values accepted by [set_error_handler](https://www.php.net/manual/en/function.set-error-handler.php) is usable.
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Default is `E_ALL`. [List of constants](https://www.php.net/manual/en/errorfunc.constants.php).
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### The global error handler
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The class also has global `set()` and `restore()` methods.
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```php
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use Phrity\Util\ErrorHandler;
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$handler = new ErrorHandler();
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$handler->set(); // Throws ErrorException on error
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$handler->set(new RuntimeException('A specified error')); // Throws provided Throwable on error
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$handler->set(function (ErrorException $error) {
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// Code to handle errors
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return $error_result;
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}); // Runs callback on error
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$handler->restore(); // Restores error handler
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```
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### Class synopsis
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```php
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Phrity\Util\ErrorHandler {
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/* Methods */
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public __construct()
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public with(callable $callback, mixed $handling = null, int $levels = E_ALL) : mixed
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public withAll(callable $callback, mixed $handling = null, int $levels = E_ALL) : mixed
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public set($handling = null, int $levels = E_ALL) : mixed
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public restore() : bool
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}
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```
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## Versions
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| Version | PHP | |
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| --- | --- | --- |
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| `1.1` | `^7.4\|^8.0` | Some improvements |
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| `1.0` | `^7.2\|^8.0` | Initial version |
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