How to solve the problem when php7 detects that the tcp port is not working

In Web development, the TCP protocol is very important. The TCP protocol is a reliable and reliable transmission protocol built on the network. However, when it comes to detecting TCP ports, php7's functionality doesn't seem to work very well.

In php5, we can use the fsockopen() function to detect the TCP port. This function can be used to open a network connection and perform some network communication. But in php7, the fsockopen() function may encounter some problems, such as being unable to open the port, unable to connect to the server, etc.

In order to solve this problem, we can use the socket_create() function and socket_connect() function to detect the TCP port. The socket_create() function is used to create a new socket, and the socket_connect() function is used to establish a socket connection. The following is a sample code:

$host = 'example.com';
$port = 80;

$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
if ($socket === false) {
    echo "Failed to create socket: " . socket_strerror(socket_last_error()) . "\n";
    exit;
}

$result = socket_connect($socket, $host, $port);
if ($result === false) {
    echo "Failed to connect to $host:$port: " . socket_strerror(socket_last_error($socket)) . "\n";
    exit;
}

socket_close($socket);
echo "Successfully connected to $host:$port.\n";

In the above code, we first create a new socket using the socket_create() function. Then, we use the socket_connect() function to establish the socket connection. If the connection fails, we can use the socket_strerror() function to print an error message. Finally, we close the socket using the socket_close() function.

Although using the socket_create() function and the socket_connect() function can solve the problem of PHP7 detecting TCP ports, this method is not as simple as the fsockopen() function. Therefore, we can consider using other languages ​​such as Python or Perl to detect TCP ports.

In short, the fsockopen() function in PHP7 may not detect the TCP port well. In order to solve this problem, we can use the socket_create() function and socket_connect() function to detect the TCP port. Although this method is not simple, it is effective.

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