Phpgd generates image thumbnails

To use PHP to generate image thumbnails, you must first ensure that the GD2 graphics library is installed on your PHP Server and use a class to generate image thumbnails. the class source code is as follows: use PHP to generate image thumbnails, make sure that the GD2 graphics library is installed on your PHP server.
Use a class to generate image thumbnails. the source code of the class is described below.
Call this method:
$ Resizeimage = new resizeimage ("Image source file address", "200", "100", "0", "thumbnail address ");
// A thumbnail can be generated with only one sentence above. the source file and the thumbnail address can be the same, and 200,100 represents the width and height respectively.
// Use the following classes to generate image thumbnails,

Class resizeimage { // Image type Var $ type; // Actual width Var $ width; // Actual height Var $ height; // Change the width Var $ resize_width; // The height after the change Var $ resize_height; // Whether to cut the image Var $ cut; // Source image Var $ srcimg; // Target Image address Var $ dstimg; // Temporarily created image Var $ im; Function resizeimage ($ img, $ wid, $ hei, $ c, $ dstpath) { $ This-> srcimg = $ img; $ This-> resize_width = $ wid; $ This-> resize_height = $ hei; $ This-> cut = $ c; // Image type $ This-> type = strtolower (substr (strrchr ($ this-> srcimg, "."), 1 )); // Initialize the image $ This-> initi_img (); // Target Image address $ This-> dst_img ($ dstpath ); //-- $ This-> width = imagesx ($ this-> im ); $ This-> height = imagesy ($ this-> im ); // Generate an image $ This-> newimg (); ImageDestroy ($ this-> im ); } Function newimg () { // Ratio of the changed image $ Resize_ratio = ($ this-> resize_width)/($ this-> resize_height ); // Ratio of the actual image $ Ratio = ($ this-> width)/($ this-> height ); If ($ this-> cut) = "1 ") // Cut the image { If ($ ratio> = $ resize_ratio) // High priority { $ Newimg = imagecreatetruecolor ($ this-> resize_width, $ this-> resize_height ); Imagecopyresampled ($ newimg, $ this-> im, 0, 0, 0, 0, $ this-> resize_width, $ this-> resize_height, ($ this-> height) * $ resize_ratio), $ this-> height ); ImageJpeg ($ newimg, $ this-> dstimg ); } If ($ ratio <$ resize_ratio) // The width is preferred. { $ Newimg = imagecreatetruecolor ($ this-> resize_width, $ this-> resize_height ); Imagecopyresampled ($ newimg, $ this-> im, 0, 0, 0, 0, $ this-> resize_width, $ this-> resize_height, $ this-> width, ($ this-> width)/$ resize_ratio )); ImageJpeg ($ newimg, $ this-> dstimg ); } } Else // No cut Chart { If ($ ratio> = $ resize_ratio) { $ Newimg = imagecreatetruecolor ($ this-> resize_width, ($ this-> resize_width)/$ ratio ); Imagecopyresampled ($ newimg, $ this-> im, 0, 0, 0, 0, $ this-> resize_width, ($ this-> resize_width)/$ ratio, $ this-> width, $ this-> height ); ImageJpeg ($ newimg, $ this-> dstimg ); } If ($ ratio <$ resize_ratio) { $ Newimg = imagecreatetruecolor ($ this-> resize_height) * $ ratio, $ this-> resize_height ); Imagecopyresampled ($ newimg, $ this-> im, 0, 0, 0, 0, ($ this-> resize_height) * $ ratio, $ this-> resize_height, $ this-> width, $ this-> height ); ImageJpeg ($ newimg, $ this-> dstimg ); } } } // Initialize the image Function initi_img () { If ($ this-> type = "jpg ") { $ This-> im = imagecreatefromjpeg ($ this-> srcimg ); } If ($ this-> type = "gif ") { $ This-> im = imagecreatefromgif ($ this-> srcimg ); } If ($ this-> type = "png ") { $ This-> im = imagecreatefrompng ($ this-> srcimg ); } } // Target Image address Function dst_img ($ dstpath) { $ Full_length = strlen ($ this-> srcimg ); $ Type_length = strlen ($ this-> type ); $ Name_length = $ full_length-$ type_length; $ Name = substr ($ this-> srcimg, 0, $ name_length-1 ); $ This-> dstimg = $ dstpath; // Echo $ this-> dstimg; } } ?>