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<?php interface ConfigValueInterface { public function __toString(); } interface ConfigWriterInterface { public function write(ConfigValueInterface $value); } class WriteManager { protected $writers = []; public function addWriter(ConfigWriterInterface $writer, $value_class) { $this->writers[$value_class] = $writer; } public function write(ConfigValueInterface $value) { $class = get_class($value); if (isset($this->writers[$class])) { $this->writers[$class]->write($value); } } } class BaseConfigValue implements ConfigValueInterface { public $storage_location; public function __toString() { return "derp"; } } class NginxConfigValue extends BaseConfigValue {} class BaseConfigWriter implements ConfigWriterInterface { public function write(ConfigValueInterface $value) { if (!$value instanceof BaseConfigValue) { throw new \RuntimeException('Invalid value type'); } echo "writing to {$value->storage_location}\n"; } } class NginxConfigWriter implements ConfigWriterInterface { public function write(ConfigValueInterface $value) { if (!$value instanceof NginxConfigValue) { throw new \RuntimeException('Invalid value type'); } echo "writing NGINX config to {$value->storage_location}\n"; } } // Mock Value objects $nginx_value = new NginxConfigValue(); $base_value = new BaseConfigValue(); $nginx_value->storage_location = $base_value->storage_location = "/some/path"; // Set up manager $manager = new WriteManager(); $manager->addWriter(BaseConfigWriter::class, BaseConfigValue::class); $manager->addWriter(NginxConfigWriter::class, NginxConfigValue::class); $manager->write($nginx_value); $manager->write($base_value);
based on MvEsG
Output for 7.0.0 - 7.2.0
Fatal error: Uncaught TypeError: Argument 1 passed to WriteManager::addWriter() must implement interface ConfigWriterInterface, string given, called in /in/rZKfp on line 84 and defined in /in/rZKfp:20 Stack trace: #0 /in/rZKfp(84): WriteManager->addWriter('BaseConfigWrite...', 'BaseConfigValue') #1 {main} thrown in /in/rZKfp on line 20
Process exited with code 255.
Output for 5.5.24 - 5.6.28
Catchable fatal error: Argument 1 passed to WriteManager::addWriter() must implement interface ConfigWriterInterface, string given, called in /in/rZKfp on line 84 and defined in /in/rZKfp on line 20
Process exited with code 255.
Output for 5.4.10 - 5.4.45
Parse error: syntax error, unexpected 'class' (T_CLASS), expecting identifier (T_STRING) or variable (T_VARIABLE) or '{' or '$' in /in/rZKfp on line 84
Process exited with code 255.
Output for 5.3.20 - 5.3.29
Parse error: syntax error, unexpected '[' in /in/rZKfp on line 18
Process exited with code 255.