PHPでcurlを使ってHTTPSにアクセスしてエラー出たときの回避策 ref: http://qiita.com/kino0104/items/8a6a6dc2404c27bc43ea

file0.txt

$curl = curl_init();

curl_setopt($curl, CURLOPT_URL, $url);
curl_setopt($curl, CURLOPT_POST, 1);
curl_setopt($curl, CURLOPT_POSTFIELDS, http_build_query($params));
curl_setopt($curl, CURLOPT_RETURNTRANSFER, 1);
//下記一行を追加
curl_setopt($curl,CURLOPT_SSL_VERIFYPEER, false);

$res = curl_exec($curl);
curl_close($curl);
var_dump($res);
exit;