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