Smarty

AnrDaemon, you have shown themselves like a foolish man, you do not need to continue to do so. You can't read message but writes the answer, i don't know may be you can not read. ))

Because 3.1.29 is not the head of the development?…
Check the dev-master.

after run composer require smarty/smarty dev-master
in dev-master file
sysplugins/smarty_internal_templatecompilerbase ...

composer require smarty/smarty dev-master

Also i not sure what you mean when say 5.3 and out of date, when i talk about php5 to php7 migrationYou didn't specify, which "PHP5".
The differ ...

Check Smarty dev/master.
Also, WHICH PHP5? If it's 5.3, then you're seriously out of date. 2 years off at least.
where i can look for dev version of smarty?
Also i not sure what you mean when say 5 ...

in Smarty3_1_29\sysplugins\smarty_internal_templatecompilerbase.php
i see
..................
return $this->smarty->registered_plugins[ Smarty::PLUGIN_COMPILER ][ $tag ][ 0 ][ 0 ]->$functi ...

Hi.

For PHP 7 is it bug "->$function[ 1 ]($args,$this);"?

Smarty3_1_29\sysplugins\smarty_internal_templatecompilerbase.php

} elseif (is_object($function[ 0 ])) {
...