php composer.phar require --prefer-dist hmphu/deathbycaptcha

"hmphu/deathbycaptcha": "*"

use hmphu\deathbycaptcha\DeathByCaptchaSocketClient;
use hmphu\deathbycaptcha\DeathByCaptchaClient;

$deathByCaptchaUser = 'Your DBC API Username Here';
$deathByCaptchaPassword = 'Your DBC API Password Here';
$client = new DeathByCaptchaSocketClient($deathByCaptchaUser, $deathByCaptchaPassword);

try {
    $balance = $client->get_balance();
    if($balance > 0){
        /* Put your CAPTCHA file name or opened file handler, and optional solving timeout (in seconds) here: */
        $captcha = $client->decode($img, DeathByCaptchaClient::DEFAULT_TIMEOUT * 2);
        if ($captcha) {
            $text = $captcha['text'];
        }
    }
} catch (DeathByCaptchaAccessDeniedException $e) {
    /* Access to DBC API denied, check your credentials and/or balance */
}