Retrieves the phone structure from a given phone number.

formatBrazilianPhone.php

<?php

/**
* @param string $phone_number
* @return string
*/
function formatBrazilianPhone($phone_number)
{
    $phone_number = preg_replace( '/[^0-9]/', '', $phone_number );
    $phone_object = [
        'ddi' => '55',
        'ddd' => null,
        'number' => null
    ];

    switch (strlen($phone_number)) {
        case 13: # (13 dígitos) CASO DDI + DDD + 9 + TELEFONE (13 Dígitos)
            $phone_object['ddd'] = substr($phone_number, 2, 2);
            $phone_object['number'] = substr($phone_number, 5);
            break;
        case 12: # (12 dígitos) CASO DDI + DDD + TELEFONE
            $phone_object['ddd'] = substr($phone_number, 2, 2);
            $phone_object['number'] = substr($phone_number, 4);
            break;
        case 11: # (11 dígitos) CASO DDD + 9 + TELEFONE
        case 10: # (10 dígitos) CASO DDD + TELEFONE
            $phone_object['ddd'] = substr($phone_number, 0, 2);
            $phone_object['number'] = substr($phone_number, 2);
            break;
        default:
            break;
    }

    return $phone_object;
}