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                <?php  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                namespace AsyncPHP\Icicle\Database\Connector;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use AsyncPHP\Doorman\Handler;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use AsyncPHP\Doorman\Task;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use AsyncPHP\Remit\Client\ZeroMqClient;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use AsyncPHP\Remit\Location\InMemoryLocation;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use AsyncPHP\Remit\Server\ZeroMqServer;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Aura\Sql\ExtendedPdo;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use Icicle\Loop;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                use PDO;  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                final class DoormanConnectorHandler implements Handler  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @inheritdoc  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param Task $task  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                     */  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    public function handle(Task $task)  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    { | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $config = $task->getData();  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        if ($config["driver"] === "mysql") { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $config += [  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                "host" => "127.0.0.1",  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                "port" => 3306,  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                "charset" => "utf8",  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                "socket" => null,  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            ];  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        if ($config["remit"]["driver"] === "zeromq") { | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $config["remit"]["server"] += [  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                "host" => "127.0.0.1",  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            ];  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $config["remit"]["client"] += [  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                "host" => "127.0.0.1",  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            ];  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $server = new ZeroMqServer(  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                new InMemoryLocation(  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                    $config["remit"]["client"]["host"],  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                    $config["remit"]["client"]["port"]  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                )  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            );  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            $client = new ZeroMqClient(  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                new InMemoryLocation(  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                    $config["remit"]["server"]["host"],  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                    $config["remit"]["server"]["port"]  | 
            
            
                                                                        
                            
            
                                    
            
            
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                                )  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            );  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $connection = new ExtendedPdo(  | 
            
            
                                                                        
                            
            
                                    
            
            
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                            new PDO($this->newConnectionString($config), $config["username"], $config["password"])  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        );  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        $server->addListener("q", function ($query, $values, $id) use ($client, $connection) { | 
            
                            
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                            $client->emit("r", [$connection->fetchAll($query, $values), $id]); | 
            
            
                                                                        
                            
            
                                    
            
            
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                        });  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        Loop\periodic(0, function () use ($server) { | 
            
                            
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                            $server->tick();  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        });  | 
            
            
                                                                        
                            
            
                                    
            
            
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                        Loop\run();  | 
            
            
                                                                        
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    /**  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * Returns a new dsn string, for PDO to connect to the database with.  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @param array $config  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     *  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     * @return string  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                     */  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    private function newConnectionString(array $config)  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($config["driver"] === "mysql") { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return "mysql:host={$config['host']};port={$config['port']};dbname={$config['database']};unix_socket={$config['socket']};charset={$config['charset']}"; | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($config["driver"] === "pgsql") { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return "pgsql:host={$config['host']};port={$config['port']};dbname={$config['database']}"; | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($config["driver"] === "sqlite") { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return "sqlite:{$config['file']}"; | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        if ($config["driver"] === "sqlsrv") { | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                            return "sqlsrv:Server={$config['host']},{$config['port']};Database={$config['database']}"; | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                        }  | 
            
            
                                                                                                            
                            
            
                                    
            
            
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                    }  | 
            
            
                                                                                                            
                                                                
            
                                    
            
            
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                }  | 
            
            
                                                        
            
                                    
            
            
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If you define a variable conditionally, it can happen that it is not defined for all execution paths.
Let’s take a look at an example:
In the above example, the variable $x is defined if you pass “foo” or “bar” as argument for $a. However, since the switch statement has no default case statement, if you pass any other value, the variable $x would be undefined.
Available Fixes
Check for existence of the variable explicitly:
Define a default value for the variable:
Add a value for the missing path: