The gd library image download class implements the php code for downloading all images on the web page

The php code is as follows:
Copy the code The code is as follows:
header("Content-type:text/html ; charset=utf-8");
if (!empty($_POST['submit']) ){
$url = $_POST['url'];
//Operations to obtain images with relative paths
$url_fields = parse_url($url);
$main_url = $url_fields['host'];
$base_url = substr($url,0,strrpos($url, '/')+1);
//Get web content
//Set proxy server
$opts = array('http'=>array(' request_fulluri'=>true));
$context = stream_context_create($opts);
$content = file_get_contents($url,false,$context);
//Match the img tag and save all matching strings to the array$ matches
$reg = "//i";
preg_match_all($reg, $content, $matches);
$count = count( $matches[0]);
for ($i=0; $i<$count; $i++){
/*Convert the urls of all images to lowercase
*$matches[1][$i] = strtolower( $matches[1][$i]);
*/
//If the image is a relative path, convert it to the full path
if (!strpos('a'.$matches[1][$i], 'http' )){
//Because '/' is the 0th position
if (strpos('a'.$matches[1][$i], '/')){
$matches[1][$i] = 'http://'.$main_url.$matches[1][$i];
}else{
$matches[1][$i] = $base_url.$matches[1][$i];
}
}
}
//Filter duplicate images
$img_arr = array_unique($matches[1]);
//Instantiate the image download class
$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 "Download completed! Haha, keep it simple! ";
}
class DownImage{
public $source;//Remote image URL
public $save_address;//Save the local address
public $set_extension; //Set the image extension
public $quality; //The quality of the image ( 0~100, 100 is the best, the default is around 75)
//Download method (select GD library image download)
public function download(){
//Get remote image information
$info = @getimagesize($this->source) ;
//Get the image extension
$mime = $info['mime'];
$type = substr(strrchr($mime, '/'), 1);
//Select different images for different image types Generate and save functions
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';
$im g_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';
$new_img_ext = 'jpg';
}
//Synthesize the local file name according to whether the extension is set
if (isset($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);
}

//Generate local file path
$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;
}
}
?>