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+Client • [Server](Server.md) • [Message](Message.md) • [Examples](Examples.md) • [Changelog](Changelog.md) • [Contributing](Contributing.md)
+
+# Websocket: Client
+
+The client can read and write on a WebSocket stream.
+It internally supports Upgrade handshake and implicit close and ping/pong operations.
+
+##  Class synopsis
+
+```php
+WebSocket\Client {
+
+    public __construct(string $uri, array $options = [])
+    public __destruct()
+    public __toString() : string
+
+    public text(string $payload) : void
+    public binary(string $payload) : void
+    public ping(string $payload = '') : void
+    public pong(string $payload = '') : void
+    public send(mixed $payload, string $opcode = 'text', bool $masked = true) : void
+    public receive() : mixed
+    public close(int $status = 1000, mixed $message = 'ttfn') : mixed
+
+    public getName() : string|null
+    public getPier() : string|null
+    public getLastOpcode() : string
+    public getCloseStatus() : int
+    public isConnected() : bool
+    public setTimeout(int $seconds) : void
+    public setFragmentSize(int $fragment_size) : self
+    public getFragmentSize() : int
+    public setLogger(Psr\Log\LoggerInterface $logger = null) : void
+}
+```
+
+## Examples
+
+### Simple send-receive operation
+
+This example send a single message to a server, and output the response.
+
+```php
+$client = new WebSocket\Client("ws://echo.websocket.org/");
+$client->text("Hello WebSocket.org!");
+echo $client->receive();
+$client->close();
+```
+
+### Listening to a server
+
+To continuously listen to incoming messages, you need to put the receive operation within a loop.
+Note that these functions **always** throw exception on any failure, including recoverable failures such as connection time out.
+By consuming exceptions, the code will re-connect the socket in next loop iteration.
+
+```php
+$client = new WebSocket\Client("ws://echo.websocket.org/");
+while (true) {
+    try {
+        $message = $client->receive();
+        // Act on received message
+        // Break while loop to stop listening
+    } catch (\WebSocket\ConnectionException $e) {
+        // Possibly log errors
+    }
+}
+$client->close();
+```
+
+### Filtering received messages
+
+By default the `receive()` method return messages of 'text' and 'binary' opcode.
+The filter option allows you to specify which message types to return.
+
+```php
+$client = new WebSocket\Client("ws://echo.websocket.org/", ['filter' => ['text']]);
+$client->receive(); // Only return 'text' messages
+
+$client = new WebSocket\Client("ws://echo.websocket.org/", ['filter' => ['text', 'binary', 'ping', 'pong', 'close']]);
+$client->receive(); // Return all messages
+```
+
+### Sending messages
+
+There are convenience methods to send messages with different opcodes.
+```php
+$client = new WebSocket\Client("ws://echo.websocket.org/");
+
+// Convenience methods
+$client->text('A plain text message'); // Send an opcode=text message
+$client->binary($binary_string); // Send an opcode=binary message
+$client->ping(); // Send an opcode=ping frame
+$client->pong(); // Send an unsolicited opcode=pong frame
+
+// Generic send method
+$client->send($payload); // Sent as masked opcode=text
+$client->send($payload, 'binary'); // Sent as masked opcode=binary
+$client->send($payload, 'binary', false); // Sent as unmasked opcode=binary
+```
+
+## Constructor options
+
+The `$options` parameter in constructor accepts an associative array of options.
+
+* `context` - A stream context created using [stream_context_create](https://www.php.net/manual/en/function.stream-context-create).
+* `filter` - Array of opcodes to return on receive, default `['text', 'binary']`
+* `fragment_size` - Maximum payload size. Default 4096 chars.
+* `headers` - Additional headers as associative array name => content.
+* `logger` - A [PSR-3](https://www.php-fig.org/psr/psr-3/) compatible logger.
+* `persistent` - Connection is re-used between requests until time out is reached. Default false.
+* `return_obj` - Return a [Message](Message.md) instance on receive, default false
+* `timeout` - Time out in seconds. Default 5 seconds.
+
+```php
+$context = stream_context_create();
+stream_context_set_option($context, 'ssl', 'verify_peer', false);
+stream_context_set_option($context, 'ssl', 'verify_peer_name', false);
+
+$client = new WebSocket\Client("ws://echo.websocket.org/", [
+    'context' => $context, // Attach stream context created above
+    'filter' => ['text', 'binary', 'ping'], // Specify message types for receive() to return
+    'headers' => [ // Additional headers, used to specify subprotocol
+        'Sec-WebSocket-Protocol' => 'soap',
+        'origin' => 'localhost',
+    ],
+    'logger' => $my_psr3_logger, // Attach a PSR3 compatible logger
+    'return_obj' => true, // Return Message instance rather than just text
+    'timeout' => 60, // 1 minute time out
+]);
+```
+
+## Exceptions
+
+* `WebSocket\BadOpcodeException` - Thrown if provided opcode is invalid.
+* `WebSocket\BadUriException` - Thrown if provided URI is invalid.
+* `WebSocket\ConnectionException` - Thrown on any socket I/O failure.
+* `WebSocket\TimeoutException` - Thrown when the socket experiences a time out.