PHP get sys http proxy conf

helper.php

<?php

/**
 * get sys http proxy conf
 * base from system PATH，and Windows get from Internet Settings
 *
 * @return array
 */
function getHttpProxyConf()
{
    $httpProxy = '';
    $httpsProxy = '';

    $proxyEnv = getenv('HTTP_PROXY');
    if (php_sapi_name() == 'cli' && $proxyEnv !== false) {
        $httpProxy = $proxyEnv;
    }
    $proxyEnv = getenv('HTTPS_PROXY');
    if ($proxyEnv !== false) {
        $httpsProxy = $proxyEnv;
    }

    if (empty($httpProxy) && empty($httpsProxy) && strpos(PHP_OS, 'WIN') !== false) {
        /**
         * @link https://stackoverflow.com/a/12618950
         */
        $proxyServer = shell_exec('reg query "HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings" | find /i "proxyserver"');
        if (!empty($proxyServer)) {
            if (preg_match("/ProxyServer *REG_SZ *?(.+)/i", $proxyServer, $matches)) {
                $proxyConf = explode(';', $matches[1]);
                foreach ($proxyConf as $item) {
                    if (preg_match("/http=.+/", $item)) {
                        $httpProxy = str_replace('http=', 'http://', $item);
                    }
                    if (preg_match("/https=.+/", $item)) {
                        $httpsProxy = str_replace('https=', 'https://', $item);;
                    }
                }
            }
        }
    }

    return [
        'http' => trim($httpProxy),
        'https' => trim($httpsProxy),
    ];
}