Use the gd Library in php to download all images on the webpage _ PHP Tutorial-php Tutorial

Use the gd Library in php to download all images on the webpage. Using the gd Library in php to download all images on the webpage this article mainly introduces how to use the gd Library in php to download all images on the webpage. This article provides the implementation code directly, you can use the gd Library in php to download all images on the webpage.

This article mainly introduces how to use the gd Library in php to download all the images on the webpage. This article provides the implementation code directly. For more information, see

In the previous php Tutorial, the php gd library can be used to download remote images. However, it only downloads an image in the same principle, to download all images on a Web page, you only need to use regular expressions to judge and find out all the image URLs to download them cyclically. I specially wrote the gd Library image download class by referring to network resources!

The php code is as follows:

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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

This article describes how to use the gd Library in php to download all images on the webpage. This article provides the implementation code directly...