(PHP 4 >= 4.1.0, PHP 5, PHP 7, PHP 8)
socket_write — Write to a socket
The function socket_write() writes to the
socket from the given
data.
socket
dataThe 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.
Returns the number of bytes successfully written to the socket 或者在失败时返回 false.
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.
注意:
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 forfalsein case of an error.
| 版本 | 说明 |
|---|---|
| 8.0.0 |
现在 socket 是 Socket 实例，
之前是 resource。
|
| 8.0.0 |
length is nullable now.
|
注意:
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.