optionally allow an array in php

MyClass.php

<?php

// ...

public function processData($input)
{
    if (is_array($input)) {
        // if it's an array, loop through each one and recursively
        // call the function we're in but this time without an
        // array. So it should skip past this line for each one.
        return array_map([$this, 'processData'], $input);
    }
    
    // process an individual item here since it is not an array...
}