[Formatar telefone]

format_phone.php

function formatPhone($phone)
{
    $formatedPhone = preg_replace('/[^0-9]/', '', $phone);
    $matches = [];
    preg_match('/^([0-9]{2})([0-9]{4,5})([0-9]{4})$/', $formatedPhone, $matches);
    if ($matches) {
        return '('.$matches[1].') '.$matches[2].'-'.$matches[3];
    }
    return $phone;
}