鉴于大家对PHP十分关注，我们编辑小组在此为大家搜集整理了“gd库图片下载类实现下载网页所有图片的php代码”一文，供大家参考学习

php代码如下:
复制代码 代码如下:
<?php
header("Content-type:text/html ; charset=utf-8");
if (!empty( POST[''submit''])){
$url = POST[''url''];
//为了获取相对路径的图片所做的操作
$url_fields = parse_url($url);
$main_url = $url_fields[''host''];
$base_url = substr($url,0,strrpos($url, ''/'')+1);
//获取网页内容
//设置代理服务器
$opts = array(''http''=>array(''request_fulluri''=>true));
$context = stream_context_create($opts);
$content = file_get_contents($url,false,$context);
//匹配img标签,将所有匹配字符串保存到数组$matches
$reg = "/<img.*?src=\"(.*?)\".*?>/i";
preg_match_all($reg, $content, $matches);
$count = count($matches[0]);
for ($i=0; $i<$count; $i++){
/*将所有图片的url转换为小写
*$matches[$i] = strtolower($matches[$i]);
*/
//如果图片为相对路径就转化为全路径
if (!strpos(''a''.$matches[$i], ''http'')){
//因为''/''是第0个位置
if (strpos(''a''.$matches[$i], ''/'')){
$matches[$i] = ''http://''.$main_url.$matches[$i];
}else{
$matches[$i] = $base_url.$matches[$i];
}
}
}
//过滤重复的图片
$img_arr = array_unique($matches);
//实例化图片下载类
$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 "下载完成！哈哈，简单吧！";
}
class DownImage{
public $source;//远程图片URL
public $save_address;//保存本地地址
public $set_extension; //设置图片扩展名
public $quality; //图片的质量（0~100,100最佳，默认75左右）
//下载方法（选用GD库图片下载）
public function download(){
//获取远程图片信息
$info = @getimagesize($this->source);
//获取图片扩展名
$mime = $info[''mime''];
$type = substr(strrchr($mime, ''/''), 1);
//不同的图片类型选择不同的图片生成和保存函数
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'';
$new_img_ext = ''jpg'';
}
//根据是否设置扩展名来合成本地文件名
if (isset($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);
}

//生成本地文件路径
$save_address = $this->save_address.$newname;
$img = @$