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Sorry if it might appear very simple, but what does that mean:
array($this, $some_method_string)
in this piece of code:
array_map(array($this, $some_method_string), $some_data)
it is a valid callback , calling the method $some_method_string on $this :
with array_map , for every element of $some_data , call
$this->$some_method_string(currentElement)