Home > Backend Development > PHP Tutorial > PHP下载远程图片并保存到本地方法总结_php实例

PHP下载远程图片并保存到本地方法总结_php实例

WBOY
Release: 2016-06-07 17:09:40
Original
776 people have browsed it

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)
Copy after login

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 class="brush:php;toolbar:false"><img  src="'.$img.'" alt="PHP下载远程图片并保存到本地方法总结_php实例" >
Copy after login
';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); 
}
Copy after login

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();
Copy after login

类文件:

<&#63;
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 
}
}
&#63;>
Copy after login

5. php 使用GD库下载远程图片

<&#63;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" alt="PHP下载远程图片并保存到本地方法总结_php实例" ></img>"; 
&#63;>

<&#63;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);
&#63;>

Copy after login

注意这个要把PHP分配内存调大,应用时用大内存服务器

source:php.cn
Statement of this Website
The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn
Popular Tutorials
More>
Latest Downloads
More>
Web Effects
Website Source Code
Website Materials
Front End Template