php curl 文件下载函数

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function curlDownFile($img_url, $save_path = '', $filename = '') {     if (trim($img_url) == '') {         return false;     }     if (trim($save_path) == '') {         $save_path = './';     }       //创建保存目录     if (!file_exists($save_path) && !mkdir($save_path, 0777, true)) {         return false;     }     if (trim($filename) == '') {         $img_ext = strrchr($img_url, '.');         $img_exts = array('.gif', '.jpg', '.png', '.mp4');         if (!in_array($img_ext, $img_exts)) {             return false;         }         $filename = time() . $img_ext;     }       // curl下载文件     $ch = curl_init();     $timeout = 5;     curl_setopt($ch, CURLOPT_URL, $img_url);     curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);     curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout);     $img = curl_exec($ch);     curl_close($ch);       // 保存文件到制定路径     file_put_contents($filename, $img);       unset($img, $url);     return true; } //curlDownFile('http://mimg.127.net/logo/163logo.gif'); curlDownFile('http://ww1.rs.fanjian.net/iv/76/15/9b/e376ab3f5e1593342f9b53ba017c8bce.mp4'); die;