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gd库图片下载类实现下载网页所有图片的php代码_php实例

WBOY
WBOYOriginal
2016-06-07 17:25:25780browse

php代码如下:

复制代码 代码如下:

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
$reg = "/gd库图片下载类实现下载网页所有图片的php代码_php实例/i";
preg_match_all($reg, $content, $matches);
$count = count($matches[0]);
for ($i=0; $i/*将所有图片的url转换为小写
*$matches[1][$i] = strtolower($matches[1][$i]);
*/
//如果图片为相对路径就转化为全路径
if (!strpos('a'.$matches[1][$i], 'http')){
//因为'/'是第0个位置
if (strpos('a'.$matches[1][$i], '/')){
$matches[1][$i] = 'http://'.$main_url.$matches[1][$i];
}else{
$matches[1][$i] = $base_url.$matches[1][$i];
}
}
}
//过滤重复的图片
$img_arr = array_unique($matches[1]);
//实例化图片下载类
$getImg = new DownImage();
$url_count = count($img_arr);
for ($i=0; $i$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;
$img = @$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;
}
}
?>

远程url地址:



运行结果如图:

gd库图片下载类实现下载网页所有图片下载的图片本例中保存在当前目录的pic文件夹下!

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