# socket_create_listen

(PHP 4 >= 4.1.0, PHP 5, PHP 7)

socket_create_listen — Opens a socket on port to accept connections

### 说明

socket_create_listen ( int `$port` [, int `$backlog` = 128 ] ) : resource

socket_create_listen() creates a new socket resource of type `AF_INET` listening on all local interfaces on the given port waiting for new connections.

This function is meant to ease the task of creating a new socket which only listens to accept new connections.

### 参数

`port`

  The port on which to listen on all interfaces.

`backlog`

  The `backlog` parameter defines the maximum length the queue of pending connections may grow to. `SOMAXCONN` may be passed as `backlog` parameter, see socket_listen() for more information.

### 返回值

socket_create_listen() returns a new socket resource on success or `FALSE` on error. 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 error.

### 注释

> Note:

> If you want to create a socket which only listens on a certain interface you need to use socket_create(), socket_bind() and socket_listen().

### 参见

- socket_create() - 创建一个套接字（通讯节点）
- socket_create_pair() - Creates a pair of indistinguishable sockets and stores them in an array
- socket_bind() - 给套接字绑定名字
- socket_listen() - Listens for a connection on a socket
- socket_last_error() - Returns the last error on the socket
- socket_strerror() - Return a string describing a socket error