PHP OO

oo.php

<?php

class PhpOo
{
    public function __call($name, array $args)
    {
        $cUFA = $this->getName('callUserFuncArray');
        return $cUFA($this->getName($name), $args);
    }
    
    private function getName($name)
    {
        foreach (str_split($name) as $l) {
            if (ctype_upper($l)) {
                $name = str_replace($l, '_' . strtolower($l), $name);
            }
        }
        
        return $name;
    }
}

echo (new PhpOo)->callUserFuncArray('strlen', ['Hello']);