Initiates a stream connection in the Internet (AF_INET,
using TCP or UDP) or Unix (AF_UNIX) domain. For the Internet
domain, it will open a TCP socket connection to hostname on port port.
hostname may in this case be either a fully
qualified domain name or an IP address. For UDP connections,
you need to explicitly specify the protocol by prefixing hostname with 'udp://'. For the Unix domain, hostname will be used as the path to
the socket, port must be
set to 0 in this case. The optional
timeout can be used to set a timeout in seconds for
the connect system call.
注: If you need to set a timeout for reading/writing data over the socket, use socket_set_timeout(), as the timeout parameter to fsockopen() only applies while connecting the socket.
As of PHP 4.3.0, if you have compiled in OpenSSL
support, you may prefix the
hostname with either 'ssl://' or 'tls://'
to use an SSL or TLS client connection over TCP/IP to connect
to the remote host.
fsockopen() returns a file
pointer which may be used together with the other file
functions (such as fgets(), fgetss(), fputs(),
fclose(), and feof()).
If the call fails, it will return
FALSE and if the optional
errno and
errstr arguments are present they will be set to
indicate the actual system level error that occurred in the
system-level connect() call. If the
value returned in errno is
0 and the function returned FALSE, it is an indication that
the error occurred before the
connect() call. This is most likely due to a problem
initializing the socket. Note that the
errno and
errstr arguments will always be passed by
reference.
Depending on the environment, the Unix domain or the
optional connect timeout may not be available.
The socket will by default be opened in blocking mode.
You can switch it to non-blocking mode by using
socket_set_blocking().
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注: The timeout parameter was introduced in PHP 3.0.9 and UDP support was added in PHP 4.