file_get_contents无法请求https连接的解决方法_PHP教程

function http_request($url,$timeout=30,$header=array()){
if (!function_exists('curl_init')) {
throw new Exception('server not install curl');
}
$ch = curl_init();
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HEADER, true);
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_TIMEOUT, $timeout);
if (!empty($header)) {
curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
}
$data = curl_exec($ch);
list($header, $data) = explode("rnrn", $data);
$http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
if ($http_code == 301 || $http_code == 302) {
$matches = array();
preg_match('/Location:(.*?)n/', $header, $matches);
$url = trim(array_pop($matches));
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_HEADER, false);
$data = curl_exec($ch);
}

if ($data == false) {
curl_close($ch);
}
@curl_close($ch);
return $data;
}