(PHP 4 >= 4.2.0, PHP 5, PHP 7)
socket_set_block — Sets blocking mode on a socket resource
socket_set_block ( resource $socket ) : bool
The socket_set_block() function removes the O_NONBLOCK flag on the socket specified by the socket parameter.
When an operation (e.g. receive, send, connect, accept, ...) is performed on a blocking socket, the script will pause its execution until it receives a signal or it can perform the operation.
socket
A valid socket resource created with socket_create() or socket_accept().
Returns true on success or false on failure.
Example #1 socket_set_block() example
<?php $socket = socket_create_listen(1223); socket_set_block($socket); socket_accept($socket); ?>
This example creates a listening socket on all interfaces on port 1223 and sets the socket to O_BLOCK mode. socket_accept() will hang until there is a connection to accept.
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https://www.php.net/manual/en/function.socket-set-block.php