Doctrine Deprecations

A small (side-effect free by default) layer on top of trigger_error(E_USER_DEPRECATED) or PSR-3 logging.

• no side-effects by default, making it a perfect fit for libraries that don’t know how the error handler works they operate under
• options to avoid having to rely on error handlers global state by using PSR-3 logging
• deduplicate deprecation messages to avoid excessive triggering and reduce overhead

We recommend to collect Deprecations using a PSR logger instead of relying on the global error handler.

Usage from consumer perspective:

Enable Doctrine deprecations to be sent to a PSR3 logger:

php \Doctrine\Deprecations\Deprecation::enableWithPsrLogger($logger);

Enable Doctrine deprecations to be sent as @trigger_error($message, E_USER_DEPRECATED) messages by setting the DOCTRINE_DEPRECATIONS environment variable to trigger. Alternatively, call:

php \Doctrine\Deprecations\Deprecation::enableWithTriggerError();

If you only want to enable deprecation tracking, without logging or calling trigger_error then set the DOCTRINE_DEPRECATIONS environment variable to track. Alternatively, call:

php \Doctrine\Deprecations\Deprecation::enableTrackingDeprecations();

Tracking is enabled with all three modes and provides access to all triggered deprecations and their individual count:

```php $deprecations = \Doctrine\Deprecations\Deprecation::getTriggeredDeprecations();

foreach ($deprecations as $identifier => $count) { echo $identifier . “ was triggered ” . $count . “ times\n”; } ```

Suppressing Specific Deprecations

Disable triggering about specific deprecations:

php \Doctrine\Deprecations\Deprecation::ignoreDeprecations("https://link/to/deprecations-description-identifier");

Disable all deprecations from a package

php \Doctrine\Deprecations\Deprecation::ignorePackage("doctrine/orm");

Other Operations

When used within PHPUnit or other tools that could collect multiple instances of the same deprecations the deduplication can be disabled:

php \Doctrine\Deprecations\Deprecation::withoutDeduplication();

Disable deprecation tracking again:

php \Doctrine\Deprecations\Deprecation::disable();

Usage from a library/producer perspective:

When you want to unconditionally trigger a deprecation even when called from the library itself then the trigger method is the way to go:

php \Doctrine\Deprecations\Deprecation::trigger( "doctrine/orm", "https://link/to/deprecations-description", "message" );

If variable arguments are provided at the end, they are used with sprintf on the message.

php \Doctrine\Deprecations\Deprecation::trigger( "doctrine/orm", "https://github.com/doctrine/orm/issue/1234", "message %s %d", "foo", 1234 );

When you want to trigger a deprecation only when it is called by a function outside of the current package, but not trigger when the package itself is the cause, then use:

php \Doctrine\Deprecations\Deprecation::triggerIfCalledFromOutside( "doctrine/orm", "https://link/to/deprecations-description", "message" );

Based on the issue link each deprecation message is only triggered once per request.

A limited stacktrace is included in the deprecation message to find the offending location.

Note: A producer/library should never call Deprecation::enableWith methods and leave the decision how to handle deprecations to application and frameworks.

Usage in PHPUnit tests

There is a VerifyDeprecations trait that you can use to make assertions on the occurrence of deprecations within a test.

```php use Doctrine\Deprecations\PHPUnit\VerifyDeprecations;

class MyTest extends TestCase { use VerifyDeprecations;

public function testSomethingDeprecation()
{
    $this->expectDeprecationWithIdentifier('https://github.com/doctrine/orm/issue/1234');

    triggerTheCodeWithDeprecation();
}

public function testSomethingDeprecationFixed()
{
    $this->expectNoDeprecationWithIdentifier('https://github.com/doctrine/orm/issue/1234');

    triggerTheCodeWithoutDeprecation();
}

} ```

What is a deprecation identifier?

An identifier for deprecations is just a link to any resource, most often a Github Issue or Pull Request explaining the deprecation and potentially its alternative.