(PHP 4 >= 4.1.0, PHP 5, PHP 7)
socket_write — Write to a socket
The function socket_write() writes to the
socket from the given
The buffer to be written.
The optional parameter
lengthcan 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
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
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
FALSEin case of an error.
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.