Code sharing for generating image thumbnails in PHP based on GD2 graphics library _ PHP Tutorial

Code sharing for generating image thumbnails based on PHP of GD2 graphics library. Code sharing for generating image thumbnails using PHP in GD2 graphics library this article mainly introduces code sharing for generating image thumbnails using PHP in GD2 graphics library, this article provides implementation code and code sharing for generating image thumbnails based on PHP of GD2 graphics library.

This article mainly introduces how to share the code for generating image thumbnails using PHP based on the GD2 graphics library. This article provides the implementation code and usage instructions. For more information, see

To use PHP to generate image thumbnails, make sure that the GD2 graphics library is installed on your PHP server to generate image thumbnails using a class.

1. usage

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1 2	$ 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.

2. thumbnail code

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// 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; } }

This article mainly introduces how to share the code of generating image thumbnails using PHP based on the GD2 graphics library. This article provides the implementation code and...