pecl/msgpack requires PHP (version >= 7.0.0)

[kingkarki]

I am getting following error while installing msgpack.

 pecl install msgpack
WARNING: channel "pecl.php.net" has updated its protocols, use "pecl channel-update pecl.php.net" to update
pecl/msgpack requires PHP (version >= 7.0.0), installed version is 5.5.9-1ubuntu4.26
No valid packages found
install failed

[m6w6]

v2 is PHP7 only.

You might have to go with v0.x like msgpack-0.5.7

See https://pecl.php.net/package-changelog.php?package=msgpack