Use Curl to download network images

When using open API interfaces such as sina and tencent, you need to save the user's profile picture. in the specific implementation process, we compared the two methods, and finally chose the CURL method to be read by CURL.

This is required to enable CURL extension before use. Tip: It seems that the CURL extension cannot be installed in a version of php 5.2.****. this is a bug.

function save_img_curl($avatar_url) {  $res = curl_init($avatar_url);  ob_start();  curl_exec($res);  $avatar_file = ob_get_contents();  ob_end_clean();  $info = curl_getinfo($res);  curl_close($res);  echo $info['total_time']."\n";  // save avatar  $up_dir = "./img/";  if (!is_dir($up_dir))  {   @mkdir($up_dir, 0777);  }   $avatar_name = time().'.jpg';  $handle = fopen($up_dir.$avatar_name, 'a');  fwrite($handle, $avatar_file);  fclose($handle);  return; } 

Note: I directly use .jpg as the extension. In fact, it depends on $ info ['content-type.

Readfile method

function save_img_curl($avatar_url) {  $time_start = time();  ob_start();   readfile($avatar_url);  $avatar_file = ob_get_contents();  ob_end_clean();  $time_end = time();  echo "\n".$time_end-$time_start."\n"; } 

Comparison & doubt

The CURL method is used to compare the two methods, and you have some questions:

• The two methods are similar when reading sina images, but they differ greatly when reading qq images. why?
• Retrieving sina images is always much faster than qq images. is it related to the Internet? But the gap is too big.