<?php class obj { protected function protected_function(){ return true; } public function internal_is_callable(){ var_dump(is_callable([$this, "protected_function"])); } } $obj = new obj(); # If called from "outside" a class, is_callable() will return FALSE var_dump(is_callable([$obj, "protected_function"])); //returns bool(false) # Confusingly, if called from "inside" a class, is_callable() will return TRUE $obj->internal_is_callable(); //returns bool(true)
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