socket_write

Write to a socket

&reftitle.description; ``int``false```socket_write` `Socket` `socket` `string` `data` ``int``null```length`&null;

The function `socket_write` writes to the `socket` from the given `data`.

&reftitle.parameters;

`socket`

`data`

- The buffer to be written.

`length`

- The optional parameter `length` can specify an alternate length of bytes written to the socket. If this length is greater than the buffer length, it is silently truncated to the length of the buffer.

&reftitle.returnvalues;

Returns the number of bytes successfully written to the socket&return.falseforfailure;. The error code can be retrieved with `socket_last_error`. This code may be passed to `socket_strerror` to get a textual explanation of the error.

It is perfectly valid for `socket_write` to return zero which means no bytes have been written. Be sure to use the `===` operator to check for &false; in case of an error.

&reftitle.changelog;

&Version; | &Description;
&sockets.changelog.socket-param;
8.0.0 | `length` is nullable now.

&reftitle.notes;

`socket_write` does not necessarily write all bytes from the given buffer. It's valid that, depending on the network buffers etc., only a certain amount of data, even one byte, is written though your buffer is greater. You have to watch out so you don't unintentionally forget to transmit the rest of your data.

&reftitle.seealso;

- `socket_accept`
- `socket_bind`
- `socket_connect`
- `socket_listen`
- `socket_read`
- `socket_strerror`