PHP下载远程图片并保存到本地方法总结


            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