PHP用curl远程下载图片

function http_get_data($url){
$ch = curl_init ();
curl_setopt ( $ch, CURLOPT_CUSTOMREQUEST, 'GET' );
curl_setopt ( $ch, CURLOPT_SSL_VERIFYPEER, false );
curl_setopt ( $ch, CURLOPT_URL, $url );
ob_start ();
curl_exec ( $ch );
$return_content = ob_get_contents ();
ob_end_clean ();
$return_code = curl_getinfo ( $ch, CURLINFO_HTTP_CODE );
return $return_content;
}