<?php
header("Content-type:text/html ; charset=utf-8");
if (!empty($_POST['submit'])){
$url = $_POST['url'];
//為了獲取相對路徑的圖片所做的操作
$url_fields = parse_url($url);
$main_url = $url_fields['host'];
$base_url = substr($url,0,strrpos($url, '/')+1);
//獲取網頁內容
//設置代理服務器
$opts = array('http'=>array('request_fulluri'=>true));
$context = stream_context_create($opts);
$content = file_get_contents($url,false,$context);
//匹配img標簽,將所有匹配字符串保存到數(shù)組$matches
$reg = "/<img.*?src=\"(.*?)\".*?>/i";
preg_match_all($reg, $content, $matches);
$count = count($matches[0]);
for ($i=0; $i<$count; $i++){
/*將所有圖片的url轉換為小寫
*$matches[1][$i] = strtolower($matches[1][$i]);
*/
//如果圖片為相對路徑就轉化為全路徑
if (!strpos('a'.$matches[1][$i], 'http')){
//因為'/'是第0個位置
if (strpos('a'.$matches[1][$i], '/')){
$matches[1][$i] = 'http://'.$main_url.$matches[1][$i];
}else{
$matches[1][$i] = $base_url.$matches[1][$i];
}
}
}
//過濾重復的圖片
$img_arr = array_unique($matches[1]);
//實例化圖片下載類
$getImg = new DownImage();
$url_count = count($img_arr);
for ($i=0; $i<$url_count; $i++){
$getImg->source = $img_arr[$i];
$getImg->save_address = './pic/';
$file = $getImg->download();
}
echo "下載完成！哈哈，簡單吧！";
}
class DownImage{
public $source;//遠程圖片URL
public $save_address;//保存本地地址
public $set_extension; //設置圖片擴展名
public $quality; //圖片的質量（0~100,100最佳，默認75左右）
//下載方法（選用GD庫圖片下載）
public function download(){
//獲取遠程圖片信息
$info = @getimagesize($this->source);
//獲取圖片擴展名
$mime = $info['mime'];
$type = substr(strrchr($mime, '/'), 1);
//不同的圖片類型選擇不同的圖片生成和保存函數(shù)
switch($type){
case 'jpeg':
$img_create_func = 'imagecreatefromjpeg';
$img_save_func = 'imagejpeg';
$new_img_ext = 'jpg';
$image_quality = isset($this->quality) ? $this->quality : 100;
break;
case 'png':
$img_create_func = 'imagecreatefrompng';
$img_save_func = 'imagepng';
$new_img_ext = 'png';
break;
case 'bmp':
$img_create_func = 'imagecreatefrombmp';
$img_save_func = 'imagebmp';
$new_img_ext = 'bmp';
break;
case 'gif':
$img_create_func = 'imagecreatefromgif';
$img_save_func = 'imagegif';
$new_img_ext = 'gif';
break;
case 'vnd.wap.wbmp':
$img_create_func = 'imagecreatefromwbmp';
$img_save_func = 'imagewbmp';
$new_img_ext = 'bmp';
break;
case 'xbm':
$img_create_func = 'imagecreatefromxbm';
$img_save_func = 'imagexbm';
$new_img_ext = 'xbm';
break;
default:
$img_create_func = 'imagecreatefromjpeg';
$img_save_func = 'imagejpeg';
$new_img_ext = 'jpg';
}
//根據(jù)是否設置擴展名來合成本地文件名
if (isset($this->set_extension)){
$ext = strrchr($this->source,".");
$strlen = strlen($ext);
$newname = basename(substr($this->source,0,-$strlen)).'.'.$new_img_ext;
}else{
$newname = basename($this->source);
}

//生成本地文件路徑
$save_address = $this->save_address.$newname;
$img = @$img_create_func($this->source);
if (isset($image_quality)){
$save_img = @$img_save_func($img,$save_address,$image_quality);
}else{
$save_img = @$img_save_func($img,$save_address);
}
return $save_img;
}
}
?>
<form method="POST" action="">
遠程url地址：<input type="text" name="url" size=30 />
<input type="submit" name="submit" value="下載該頁面所有圖片" />
</form>