Adding upstream version 0.12.1+ds.upstream/0.12.1+dsupstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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+# 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.