# socket_cmsg_space

(PHP 5 >= 5.5.0, PHP 7, PHP 8)

socket_cmsg_space — Calculate message buffer size

### 说明

socket_cmsg_space(int `$level`, int `$type`, int `$num` = 0): ?int

Calculates the size of the buffer that should be allocated for receiving the ancillary data.

警告

本函数还未编写文档，仅有参数列表。

### 参数

`level`

`type`

### 返回值

### 参见

- socket_recvmsg() - Read a message
- socket_sendmsg() - Send a message

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