undefined function add_filter() and apply_filters() · Issue #1310 · wp-cli/wp-cli · GitHub
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WordPress function add_filter not working [Solved] - Nabtron
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Fatal error: Call to undefined function add_filter() in phar:///usr/local/bin/wp/php/wp-cli.php(23) : eval()'d code on line 91 · Issue #1586 · wp-cli/wp-cli · GitHub
Zero and one argument for add_filter being "the same" · Issue #29 · WordPress/Documentation-Issue-Tracker · GitHub
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Custom plugin with add_filter fails to activate · Issue #5 · inpsyde/menu-cache · GitHub
Call to undefined function add_filter() · Issue #3574 · wp-cli/wp-cli · GitHub
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add_filter()/do_action() - neither working · Issue #361 · DevinVinson/WordPress-Plugin-Boilerplate · GitHub
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