php 下载远程图片 的几种方法？转

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’])?’/’:$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("http://www.dianpub.com/download/xml.rar")

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($img):echo '<pre><img src="'.$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."/".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 = $imgPath."/".$milliSecond.$key.".".substr($value,-3,3);

$fileurl = $imgUrl."/".$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

<?php

$imgname = "http://imgdujia.kuxun.cn/newpic/929/812929/4.jpg";

$src_im = imagecreatefromjpeg($imgname);

$srcW = ImageSX($src_im); //获得图像的宽

$srcH = ImageSY($src_im); //获得图像的高

$dst_im = ImageCreateTrueColor($srcW,$srcH); //创建新的图像对象

imagecopy($dst_im, $src_im, 0, 0, 0, 0, $srcW, $srcH);

imagejpeg($dst_im, "newpic.jpg"); //创建缩略图文件

echo "<img src="newpic.jpg" mce_src="newpic.jpg"></img>";

?>

<?php

header("Content-type: image/png");

$im = imagecreatefromjpeg("http://postimg.mop.com/200602/02/74/122374/200602022335325121.JPG");

$white = imagecolorallocate($im, 0xF9, 0xD7, 0xCD);

imagefill($im, 0, 0,$white);

$text_color = imagecolorallocate($im, 233, 14, 91);

imagestring($im, 1, 5, 5, "A Simple Text String", $text_color);

imagepng($im);

imagedestroy($im);

?>

注意这个要把PHP分配内存调大，应用时用大内存服务器