final private function copyContent(string $content, int $coef):string
    {
        $str = "";
        for ($i = 0; $i < $coef; $i++) {
            $str = $str.$content;
        }
        return ($str);
    }
final private function copyContent(string $content, int $coef):string
    {
        $str = "";
        for ($i = 0; $i < $coef; $i++) {
            $str = $str.$content;
        }
        return ($str);
    }
final private function copyContent ( string $ content , int $ coef ) : string { $ str = "" ; for ( $ i = 0 ; $ i < $ coef ; $ i ++ ) { $ str = $ str . $ content ; } return ( $ str ) ; }
Copy a string several times
@param string $content Content to copy
@param int $coef Coefficient
@return string The result of opy
@method copyContent
Copy a string several times