Check if the IMAP stream is still valid

# imap_is_open

(PHP 8 >= 8.2.1)

imap_is_open — Check if the IMAP stream is still valid

### 说明

function imap_is_open(IMAP\Connection `$imap`): bool

Check if the IMAP stream is still valid.

### 参数

`imap`
  IMAP\Connection 实例。

### 返回值

Returns `true` if the stream is still valid, `false` otherwise.

### 示例

示例 #1 imap_is_open() example

    <?php
    $mbox = imap_open("{imap.example.org:143}INBOX", "username", "password") or die(implode(", ", imap_errors()));
    imap_is_open($mbox);
    // ...
    ?>

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