https client

https_client.php

<?php

$url="https://weixin.qq.com";
$url="https://www.alipay.com";
$url="https://www.baidu.com";
// Initialize session and set URL.
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);

// Set so curl_exec returns the result instead of outputting it.
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, true);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, 2);
curl_setopt($ch, CURLOPT_SSL_FALSESTART, 1);
curl_setopt($ch, CURLOPT_SSL_ENABLE_ALPN, 1);
// CURLOPT_CAINFO is auto detected,see http://docs.guzzlephp.org/en/latest/request-options.html#verify
// https://github.com/dropbox/dropbox-sdk-php/blob/master/lib/Dropbox/Curl.php

for($i=0;$i<10;++$i){
    // Get the response and close the channel.
    $response = curl_exec($ch);
    if($response){
        echo $response;
    }else{
        echo "GET ",$url," failed.\n";
    }
}

curl_close($ch);