# cURL protocol constants

`CURLPROTO_ALL` (`int`)

- Available as of cURL 7.19.4.

`CURLPROTO_DICT` (`int`)

- Available as of cURL 7.19.4.

`CURLPROTO_FILE` (`int`)

- Available as of cURL 7.19.4.

`CURLPROTO_FTP` (`int`)

- Available as of cURL 7.19.4.

`CURLPROTO_FTPS` (`int`)

- Available as of cURL 7.19.4.

`CURLPROTO_GOPHER` (`int`)

- Available as of cURL 7.21.2.

`CURLPROTO_HTTP` (`int`)

- Available as of cURL 7.19.4.

`CURLPROTO_HTTPS` (`int`)

- Available as of cURL 7.19.4.

`CURLPROTO_IMAP` (`int`)

- Available as of cURL 7.20.0.

`CURLPROTO_IMAPS` (`int`)

- Available as of cURL 7.20.0.

`CURLPROTO_LDAP` (`int`)

- Available as of cURL 7.19.4.

`CURLPROTO_LDAPS` (`int`)

- Available as of cURL 7.19.4.

`CURLPROTO_MQTT` (`int`)

- Available as of PHP 8.2.0 and cURL 7.71.0.

`CURLPROTO_POP3` (`int`)

- Available as of cURL 7.20.0.

`CURLPROTO_POP3S` (`int`)

- Available as of cURL 7.20.0.

`CURLPROTO_RTMP` (`int`)

- Available as of cURL 7.21.0.

`CURLPROTO_RTMPE` (`int`)

- Available as of cURL 7.21.0.

`CURLPROTO_RTMPS` (`int`)

- Available as of cURL 7.21.0.

`CURLPROTO_RTMPT` (`int`)

- Available as of cURL 7.21.0.

`CURLPROTO_RTMPTE` (`int`)

- Available as of cURL 7.21.0.

`CURLPROTO_RTMPTS` (`int`)

- Available as of cURL 7.21.0.

`CURLPROTO_RTSP` (`int`)

- Available as of cURL 7.20.0.

`CURLPROTO_SCP` (`int`)

- Available as of cURL 7.19.4.

`CURLPROTO_SFTP` (`int`)

- Available as of cURL 7.19.4.

`CURLPROTO_SMB` (`int`)

- Available as of PHP 7.0.7 and cURL 7.40.0.

`CURLPROTO_SMBS` (`int`)

- Available as of PHP 7.0.7 and cURL 7.40.0.

`CURLPROTO_SMTP` (`int`)

- Available as of cURL 7.20.0.

`CURLPROTO_SMTPS` (`int`)

- Available as of cURL 7.20.0.

`CURLPROTO_TELNET` (`int`)

- Available as of cURL 7.19.4.

`CURLPROTO_TFTP` (`int`)

- Available as of cURL 7.19.4.