changing variable through filters or action hooks

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It won’t work the way you are doing it, but you are close. The reason you have to use a global is that you aren’t setting your $meta variable with the information returned from the filter.

This:

do_action('alter_loop',$meta);

Should be this:

$meta = apply_filters('alter_loop',$meta);

Note: “Actions” do not return values. “Actions” do things. “Filters” accept data and return it.

Related:

https://wordpress.stackexchange.com/a/103644/21376
https://wordpress.stackexchange.com/a/1008/21376

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