In the previous php Tutorial, the phpgd library can be used to download remote images. However, it only downloads an image in the same principle, to download all the images on a Web page, you only need to use regular expressions to judge and find out all the image URLs. The php code is as follows:
Copy codeThe 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 );
// Obtain the webpage content
// Sets the 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 letters
* $ Matches [1] [$ I] = strtolower ($ matches [1] [$ I]);
*/
// Convert the image to the full path if it is a relative path
If (! Strpos ('A'. $ matches [1] [$ I], 'http ')){
// Because '/' is 0th locations
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 complete! Haha, that's easy! ";
}
Class DownImage {
Public $ source; // remote image URL
Public $ save_address; // save the local address
Public $ set_extension; // sets the image extension.
Public $ quality; // image quality (0 ~ 100,100 is the best. the default value is about 75)
// Download method (using GD Library image download)
Public function download (){
// Obtain remote image information
$ Info = @ getimagesize ($ this-> source );
// Obtain the image extension.
$ Mime = $ info ['Mime '];
$ Type = substr (strrchr ($ mime, '/'), 1 );
// Select different image generation and storage functions for different Image types
Switch ($ type ){
Case 'jpeg ':
$ Img_create_func = 'imagecreatefromjpeg ';
$ Img_save_func = 'imagejpeg ';
$ New_img_ext = 'jpg ';
$ Image_quality = isset ($ this-> quality )? $ This-& gt; 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 ';
}
// Merge local file names based on whether to set the extension.
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 the 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;
}
}
?>
Running result
The downloaded image is saved in the pic folder of the current directory in this example!
