php 实现图片批量下载的方法

实现图片的批量下载，有两种形式，一种是直接下载图片到本地服务器，还有一种是弹出下载界面，将图片保存在本地电脑或其他客户端。

第一种相对比较简单，网上的方法和函数有很多，下面的代码是相对比较简单的一种函数方法。

此段代码是可以直接运行的，是将图片放在本地服务器中

$t="http://grbang.com/jdxt/Uploads/2016/01/05/568b32d52952b.jpg;http://grbang.com/jdxt/Uploads/2016/01/05/568b32d716636.jpg;http://grbang.com/jdxt/Uploads/2016/01/05/568b32da0f897.jpg;http://grbang.com/jdxt/Uploads/2016/01/05/568b32db8ae15.jpg;http://grbang.com/jdxt/Uploads/2016/01/05/568b32dd95340.jpg";

$urls = [];

$urls=explode(';',$t);

for ($i = 0; $i < count($urls); ++$i){

download($urls[$i]);

}

function download($url) {

if( empty($url) )

return false;

set_time_limit(24*60*60); //限制最大的执行时间

$path= "D:/load/"; //文件保存目录

if(!file_exists($path)){

mkdir($path, 0777);

}

$suffix = ".jpg";

$file_name = date("YmdHis") . rand(0, 1000) . $suffix;//文件保存名字

$new_file_name = $path.$file_name;//文件PATH

$file_handle = fopen( $url, 'rb' );

if( $file_handle ){

$new_file_handle = fopen( $new_file_name, 'wb' );

if( $new_file_handle ){

while( !feof( $file_handle ) ){

fwrite( $new_file_handle, fread( $file_handle, 1024*8 ), 1024*8 );

}

}

if( $file_handle ){

fclose( $file_handle );

}

if( $new_file_handle ){

fclose( $new_file_handle );

}

}

echo $new_file_name;

}

第二种是将图片批量下载到任意客户端，工作原理：需要先将需要处理的图片进行打包处理，然后对其进行下载

class zipfile {

var $datasec = array ();

var $ctrl_dir = array ();

var $eof_ctrl_dir = "\x50\x4b\x05\x06\x00\x00\x00\x00";

var $old_offset = 0;

function unix2_dostime($unixtime = 0){

$timearray = ($unixtime == 0) ? getdate () : getdate($unixtime);

if ($timearray ['year'] < 1980){

$timearray ['year'] = 1980;

$timearray ['mon'] = 1;

$timearray ['mday'] = 1;

$timearray ['hours'] = 0;

$timearray ['minutes'] = 0;

$timearray ['seconds'] = 0;

}

return (($timearray ['year'] - 1980) << 25) | ($timearray ['mon'] << 21) | ($timearray ['mday'] << 16) | ($timearray ['hours'] << 11) | ($timearray ['minutes'] << 5) | ($timearray ['seconds'] >> 1);

}

function add_file($data, $name, $time = 0){

$name = str_replace('\\', '/', $name);

$dtime = dechex($this->unix2_dostime($time));

$hexdtime = '\x' . $dtime [6] . $dtime [7] . '\x' . $dtime [4] . $dtime [5] . '\x' . $dtime [2] . $dtime [3] . '\x' . $dtime [0] . $dtime [1];

eval('$hexdtime = "' . $hexdtime . '";');

$fr = "\x50\x4b\x03\x04";

$fr .= "\x14\x00";

$fr .= "\x00\x00";

$fr .= "\x08\x00";

$fr .= $hexdtime;

$unc_len = strlen($data);

$crc = crc32($data);

$zdata = gzcompress($data);

$zdata = substr(substr($zdata, 0, strlen($zdata)- 4), 2);

$c_len = strlen($zdata);

$fr .= pack('V', $crc);

$fr .= pack('V', $c_len);

$fr .= pack('V', $unc_len);

$fr .= pack('v', strlen($name));

$fr .= pack('v', 0);

$fr .= $name;

$fr .= $zdata;

$fr .= pack('V', $crc);

$fr .= pack('V', $c_len);

$fr .= pack('V', $unc_len);

$this->datasec [] = $fr;

$cdrec = "\x50\x4b\x01\x02";

$cdrec .= "\x00\x00";

$cdrec .= "\x14\x00";

$cdrec .= "\x00\x00";

$cdrec .= "\x08\x00";

$cdrec .= $hexdtime;

$cdrec .= pack('V', $crc);

$cdrec .= pack('V', $c_len);

$cdrec .= pack('V', $unc_len);

$cdrec .= pack('v', strlen($name));

$cdrec .= pack('v', 0);

$cdrec .= pack('v', 0);

$cdrec .= pack('v', 0);

$cdrec .= pack('v', 0);

$cdrec .= pack('V', 32);

$cdrec .= pack('V', $this->old_offset);

$this->old_offset += strlen($fr);

$cdrec .= $name;

$this->ctrl_dir[] = $cdrec;

}

function add_path($path, $l = 0){

$d = @opendir($path);

$l = $l > 0 ? $l : strlen($path) + 1;

while($v = @readdir($d)){

if($v == '.' || $v == '..'){

continue;

}

$v = $path . '/' . $v;

if(is_dir($v)){

$this->add_path($v, $l);

} else {

$this->add_file(file_get_contents($v), substr($v, $l));

}

}

}

function file(){

$data = implode('', $this->datasec);

$ctrldir = implode('', $this->ctrl_dir);

return $data . $ctrldir . $this->eof_ctrl_dir . pack('v', sizeof($this->ctrl_dir)) . pack('v', sizeof($this->ctrl_dir)) . pack('V', strlen($ctrldir)) . pack('V', strlen($data)) . "\x00\x00";

}

function add_files($files){

foreach($files as $file){

if (is_file($file)){

$data = implode("", file($file));

$this->add_file($data, $file);

}

}

}

function output($file){

$fp = fopen($file, "w");

fwrite($fp, $this->file ());

fclose($fp);

}

}

$dfile = tempnam('/tmp', 'tmp');//产生一个临时文件，用于缓存下载文件

$zip = new zipfile();

//----------------------

$filename = 'image.zip'; //下载的默认文件名

//$image = array(

// array('image_src' => 'pic1.jpg', 'image_name' => '图片1.jpg'),

// array('image_src' => 'pic2.jpg', 'image_name' => '图片2.jpg'),

//);

//var_dump($image);

$t="http://grbang.com/jdxt/Uploads/2016/01/05/568b32d52952b.jpg;http://grbang.com/jdxt/Uploads/2016/01/05/568b32d716636.jpg;http://grbang.com/jdxt/Uploads/2016/01/05/568b32da0f897.jpg;http://grbang.com/jdxt/Uploads/2016/01/05/568b32db8ae15.jpg;http://grbang.com/jdxt/Uploads/2016/01/05/568b32dd95340.jpg";

$arr=[];

$urls = [];

$urls=explode(';',$t);

for($i=0;$i<count($urls);$i++){

$arr[$i]['image_src']=$urls[$i];

$arr[$i]['image_name']='pic/'.$i.'.jpg';

}

//var_dump($arr);

foreach($arr as $v){

//$zip->add_path($urls);

$zip->add_file(file_get_contents($v['image_src']), $v['image_name']);

// 添加打包的图片，第一个参数是图片内容，第二个参数是压缩包里面的显示的名称, 可包含路径

// 或是想打包整个目录 用 $zip->add_path($image_path);

}

//----------------------

$zip->output($dfile);

/* 下载文件*/

ob_clean();

header('Pragma: public');

header('Last-Modified:'.gmdate('D, d M Y H:i:s') . 'GMT');

header('Cache-Control:no-store, no-cache, must-revalidate');

header('Cache-Control:pre-check=0, post-check=0, max-age=0');

header('Content-Transfer-Encoding:binary');

header('Content-Encoding:none');

header('Content-type:multipart/form-data');

header('Content-Disposition:attachment; filename="'.$filename.'"'); //设置下载的默认文件名

header('Content-length:'. filesize($dfile));

$fp = fopen($dfile, 'r');

while(connection_status() == 0 && $buf = @fread($fp, 8192)){

echo $buf;

}

fclose($fp);

@unlink($dfile);

@flush();

@ob_flush();

exit();