minor #1770 Remove dead code (stof)
minor #1770 Remove dead code (stof)

This PR was merged into the 1.x branch.

Discussion
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Remove dead code

Array keys cannot be objects in PHP.

Commits
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a07ac6a Remove dead code

fsw/Twig,jamessingizi/Twig,nicolas-grekas/Twig,moufmouf/Twig,znerol/Twig,framewr/Twig,Rvanlaak/Twig,iKwinto/Twig,iKwinto/Twig,znerol/Twig,hhamon/Twig,moufmouf/Twig,hhamon/Twig,derickr/Twig,apishka/templater,gamernetwork/Twig,huang53798584/Twig,framewr/Twig,fsw/Twig,Tobion/Twig,moufmouf/Twig,gamernetwork/Twig,Tobion/Twig,huang53798584/Twig,nicolas-grekas/Twig,twigphp/Twig,jamessingizi/Twig,loi-chuanoi/Twig,derickr/Twig,gencer/Twig,craue/Twig,derickr/Twig,znerol/Twig,nicolas-grekas/Twig,craue/Twig,fsw/Twig,dkarvounaris/Twig,nicolas-grekas/Twig,dkarvounaris/Twig,jamessingizi/Twig,Rvanlaak/Twig,Rvanlaak/Twig,iKwinto/Twig,Tobion/Twig,framewr/Twig,dkarvounaris/Twig,huang53798584/Twig,gencer/Twig,apishka/templater,gamernetwork/Twig,hhamon/Twig,twigphp/Twig,twigphp/Twig,nicolas-grekas/Twig