Gets the number of messages in the current mailbox

# imap_num_msg

(PHP 4, PHP 5, PHP 7, PHP 8)

imap_num_msg — Gets the number of messages in the current mailbox

### 说明

function imap_num_msg(IMAP\Connection `$imap`): int|false

Gets the number of messages in the current mailbox.

### 参数

`imap`
  IMAP\Connection 实例。

### 返回值

Return the number of messages in the current mailbox, as an integer, or `false` on error.

### 更新日志

版本 | 说明
--- | ---
8.1.0 | 现在 `imap` 参数接受 IMAP\Connection 实例，之前接受有效的 `imap` resource。

### 参见

- imap_num_recent() - Gets the number of recent messages in current mailbox
- imap_status() - Returns status information on a mailbox

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