Returns headers for all messages in a mailbox

# imap_headers

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

imap_headers — Returns headers for all messages in a mailbox

### Description

imap_headers(IMAP\Connection `$imap`): array|false

Returns headers for all messages in a mailbox.

### Parameters

`imap`

  An IMAP\Connection instance.

### Return Values

Returns an array of string formatted with header info. One element per mail message. Returns `false` on failure.

### Changelog

Version | Description
--- | ---
8.1.0 | The `imap` parameter expects an IMAP\Connection instance now; previously, a valid `imap` resource was expected.

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