socket_set_block

(PHP 4 >= 4.2.0, PHP 5, PHP 7)

socket_set_block — Sets blocking mode on a socket resource

说明

bool socket_set_block ( resource $socket )

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.

参数

socket

A valid socket resource created with socket_create() or socket_accept().

返回值

成功时返回 TRUE， 或者在失败时返回 FALSE。

范例

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.

参见

User Contributed Notes

laacz at laacz dot lv 05-Dec-2014 05:43
Besides true and false socket_set_block might return NULL if you're not too careful. That would happen when passing non socket resource as first parameter.

E.g. socket_set_block(false)) would return NULL and emit warning that you're trying to do things with non-socket.