1.获取远程文件大小及信息的函数
function getFileSize($url){ $url = parse_url($url); if($fp = @fsockopen($url['host'],empty($url['port'])?80:$url['port'],$error)){ fputs($fp,"GET ".(empty($url['path'])?'https://www.jb51.net/':$url['path'])." HTTP/1.1\r\n"); fputs($fp,"Host:$url[host]\r\n\r\n"); while(!feof($fp)){ $tmp = fgets($fp); if(trim($tmp) == ''){ break; }else if(preg_match('/Content-Length:(.*)/si',$tmp,$arr)){ return trim($arr[1]); } } return null; }else{ return null; } } echo getFileSize()
2.图片
//记录程序开始的时间 $BeginTime=getmicrotime(); function GrabImage($url,$filename="") { if($url==""):return false;endif; if($filename=="") { $ext=strrchr($url,"."); if($ext!=".gif" && $ext!=".jpg"):return false;endif; $filename=date("dMYHis").$ext; } ob_start(); readfile($url); $img = ob_get_contents(); ob_end_clean(); $size = strlen($img); $fp2=@fopen($filename, "a"); fwrite($fp2,$img); fclose($fp2); return $filename; } $img=GrabImage("http://www.dianpub.com/images/_1978837_detector_ap100.jpg",""); if($img):echo '<pre><img src="'https://www.jb51.net/article/.$img.'"></pre>';else:echo "false";endif; //记录程序运行结束的时间 $EndTime=getmicrotime(); //返回运行时间 exit($EndTime-$BeginTime);
3.全文下载图片
if(!empty($saveremoteimg)) { $body = stripslashes($body); $img_array = array(); preg_match_all("/(src|SRC)=[\"|'| ]{0,}(http:\/\/(.*)\.(gif|jpg|jpeg|bmp|png))/isU",$body,$img_array); $img_array = array_unique($img_array[2]); set_time_limit(0); $imgUrl = $img_dir."https://www.jb51.net/".strftime("%Y%m%d",time()); $imgPath = $base_dir.$imgUrl; $milliSecond = strftime("%H%M%S",time()); if(!is_dir($imgPath)) @mkdir($imgPath,0777); foreach($img_array as $key =>$value) { $value = trim($value); $get_file = @file_get_contents($value); $rndFileName = $imgPath."https://www.jb51.net/".$milliSecond.$key.".".substr($value,-3,3); $fileurl = $imgUrl."https://www.jb51.net/".$milliSecond.$key.".".substr($value,-3,3); if($get_file) { $fp = @fopen($rndFileName,"w"); @fwrite($fp,$get_file); @fclose($fp); } $body = ereg_replace($value,$fileurl,$body); } $body = addslashes($body); }
4.PHP远程文件下载类（支持断点续传）
1）.功能:支持断点续传的下载,能计算传输率,能控制传输率
简易使用方法:
$object = new httpdownload(); $object->set_byfile($file);//服务器文件名,包括路径 $object->filename = $filename;//下载另存为的文件名 $object->download();
类文件：
<? class httpdownload { var $data = null; var $data_len = 0; var $data_mod = 0; var $data_type = 0; var $data_section = 0; //section download var $sentSize=0; var $handler = array('auth' => null); var $use_resume = true; var $use_autoexit = false; var $use_auth = false; var $filename = null; var $mime = null; var $bufsize = 2048; var $seek_start = 0; var $seek_end = -1; var $totalsizeref = 0; var $bandwidth = 0; var $speed = 0; function initialize() { global $HTTP_SERVER_VARS; if ($this->use_auth) //use authentication { if (!$this->_auth()) //no authentication { header('WWW-Authenticate: Basic realm="Please enter your username and password"'); header('HTTP/1.0 401 Unauthorized'); header('status: 401 Unauthorized'); if ($this->use_autoexit) exit(); return false; } } if ($this->mime == null) $this->mime = "application/octet-stream"; //default mime if (isset($_SERVER['HTTP_RANGE']) || isset($HTTP_SERVER_VARS['HTTP_RANGE'])) { if (isset($HTTP_SERVER_VARS['HTTP_RANGE'])) $seek_range = substr($HTTP_SERVER_VARS['HTTP_RANGE'] , strlen('bytes=')); else $seek_range = substr($_SERVER['HTTP_RANGE'] , strlen('bytes=')); $range = explode('-',$seek_range); if ($range[0] > 0) { $this->seek_start = intval($range[0]); } if ($range[1] > 0) $this->seek_end = intval($range[1]); else $this->seek_end = -1; if (!$this->use_resume) { $this->seek_start = 0; //header("HTTP/1.0 404 Bad Request"); //header("Status: 400 Bad Request"); //exit; //return false; } else { $this->data_section = 1; } } else { $this->seek_start = 0; $this->seek_end = -1; } $this->sentSize=0; return true; } function header($size,$seek_start=null,$seek_end=null) { header('Content-type: ' . $this->mime); header('Content-Disposition: attachment; filename="' . $this->filename . '"'); header('Last-Modified: ' . date('D, d M Y H:i:s \G\M\T' , $this->data_mod)); if ($this->data_section && $this->use_resume) { header("HTTP/1.0 206 Partial Content"); header("Status: 206 Partial Content"); header('Accept-Ranges: bytes'); header("Content-Range: bytes $seek_start-$seek_end/$size"); header("Content-Length: " . ($seek_end - $seek_start + 1)); } else { header("Content-Length: $size"); } } function download_ex($size) { if (!$this->initialize()) return false; ignore_user_abort(true); //Use seek end here if ($this->seek_start > ($size - 1)) $this->seek_start = 0; if ($this->seek_end <= 0) $this->seek_end = $size - 1; $this->header($size,$seek,$this->seek_end); $this->data_mod = time(); return true; } function download() { if (!$this->initialize()) return false; try { error_log("begin download\n", 3,"/usr/local/www/apache22/LOGS/apache22_php.err"); $seek = $this->seek_start; $speed = $this->speed; $bufsize = $this->bufsize; $packet = 1; //do some clean up @ob_end_clean(); $old_status = ignore_user_abort(true); @set_time_limit(0); $this->bandwidth = 0; $size = $this->data_len; if ($this->data_type == 0) //download from a file { $size = filesize($this->data); if ($seek > ($size - 1)) $seek = 0; if ($this->filename == null) $this->filename = basename($this->data); $res = fopen($this->data,'rb'); if ($seek) fseek($res , $seek); if ($this->seek_end < $seek) $this->seek_end = $size - 1; $this->header($size,$seek,$this->seek_end); //always use the last seek $size = $this->seek_end - $seek + 1; while (!(connection_aborted() || connection_status() == 1) && $size > 0) { if ($size < $bufsize) { echo fread($res , $size); $this->bandwidth += $size; $this->sentSize+=$size; } else { echo fread($res , $bufsize); $this->bandwidth += $bufsize; $this->sentSize+=$bufsize; } $size -= $bufsize; flush(); if ($speed > 0 && ($this->bandwidth > $speed*$packet*1024)) { sleep(1); $packet++; } } fclose($res); } elseif ($this->data_type == 1) //download from a string { if ($seek > ($size - 1)) $seek = 0; if ($this->seek_end < $seek) $this->seek_end = $this->data_len - 1; $this->data = substr($this->data , $seek , $this->seek_end - $seek + 1); if ($this->filename == null) $this->filename = time(); $size = strlen($this->data); $this->header($this->data_len,$seek,$this->seek_end); while (!connection_aborted() && $size > 0) { if ($size < $bufsize) { $this->bandwidth += $size; $this->sentSize+=$size; } else { $this->bandwidth += $bufsize; $this->sentSize+=$bufsize; } echo substr($this->data , 0 , $bufsize); $this->data = substr($this->data , $bufsize); $size -= $bufsize; flush(); if ($speed > 0 && ($this->bandwidth > $speed*$packet*1024)) { sleep(1); $packet++; } } } else if ($this->data_type == 2) { //just send a redirect header header('location: ' . $this->data); } if($this->totalsizeref==$this->sentSize )error_log("end download\n", 3,"/usr/local/www/apache22/LOGS/apache22_php.err"); else error_log("download is canceled\n", 3,"/usr/local/www/apache22/LOGS/apache22_php.err"); if ($this->use_autoexit) exit(); //restore old status ignore_user_abort($old_status); set_time_limit(ini_get("max_execution_time")); } catch(Exception $e) { error_log("cancel download\n".$e, 3,"/usr/local/www/apache22/LOGS/apache22_php.err"); } return true; } function set_byfile($dir) { if (is_readable($dir) && is_file($dir)) { $this->data_len = 0; $this->data = $dir; $this->data_type = 0; $this->data_mod = filemtime($dir); $this->totalsizeref = filesize($dir); return true; } else return false; } function set_bydata($data) { if ($data == '') return false; $this->data = $data; $this->data_len = strlen($data); $this->data_type = 1; $this->data_mod = time(); return true; } function set_byurl($data) { $this->data = $data; $this->data_len = 0; $this->data_type = 2; return true; } function set_lastmodtime($time) { $time = intval($time); if ($time <= 0) $time = time(); $this->data_mod = $time; } function _auth() { if (!isset($_SERVER['PHP_AUTH_USER'])) return false; if (isset($this->handler['auth']) && function_exists($this->handler['auth'])) { return $this->handler['auth']('auth' , $_SERVER['PHP_AUTH_USER'],$_SERVER['PHP_AUTH_PW']); } else return true; //you must use a handler } } ?>
5. php 使用GD库下载远程图片