Calculate message buffer size

# socket_cmsg_space

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

socket_cmsg_space — Calculate message buffer size

### Description

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.

Warning

This function is currently not documented; only its argument list is available.

### Parameters

`level`

`type`

### Return Values

### See Also

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

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