PHP关于curl_setopt几个参数设置的说明
CURLOPT_HEADER 设置http头部信息是否输出，1---输出，0---不输出
CURLOPT_RETURNTRANSFER 设置curl请求返回的信息是直接显示，还是以字符串的格式输出,1---字符串形式输出，0---直接显示
CURLOPT_POSTFIELDS 设置请求的参数，如果参数中含有文件名，必须是完整的路径，并且须带上@，一般以数组的形式输出
CURLOPT_COOKIEJAR 设置当前请求结束后存储cookie的文件名
CURLOPT_COOKIEFILE 设置当前请求需要使用的cookie信息存储的文件名
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