Thumbnails generated by php

Generating thumbnails is a common practice when we want to upload images. If the images are large, we need to generate a small image of the specified size to display it on the list page. This saves resources, next I will share a php thumbnail generation class that supports custom height and width. It also supports high and wide

The Code is as follows:

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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; } } $ Resizeimage = new resizeimage ("11.jpg"," 200 "," 150 "," 1 "," 17.jpg "); ?>

Instance 2

The Code is as follows:

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<? Php /** * Generating thumbnails * @ Author yangzhiguo0903@163.com * @ Param string the absolute complete source image address {with a file name and suffix} * @ Param string the absolute complete address of the Target Image {with the file name and suffix} * @ Param int thumbnail width {0: The target height cannot be 0, and the target width is the source Image Width * (Target Height/source Image Height )} * @ Param int thumbnail height {0: The target width cannot be 0, and the target height is the source Image Height * (target width/source image width )} * @ Param int whether to crop {width, height must be not 0} * @ Param int/float scale {0: No scale, 0 <this <1: scale to the corresponding proportion (in this case, the width and height limit and cropping are invalid )} * @ Return boolean */ Function img2thumb ($ src_img, $ dst_img, $ width = 75, $ height = 75, $ cut = 0, $ proportion = 0) { If (! Is_file ($ src_img )) { Return false; } $ Ot = fileext ($ dst_img ); $ Otfunc = 'image'. ($ ot = 'jpg '? 'Jpeg ': $ ot ); $ Srcinfo = getimagesize ($ src_img ); $ Src_w = $ srcinfo [0]; $ Src_h = $ srcinfo [1]; $ Type = strtolower (substr (image_type_to_extension ($ srcinfo [2]), 1 )); $ Createfun = 'imagecreatefrom '. ($ type = 'jpg '? 'Jpeg ': $ type ); $ Dst_h = $ height; $ Dst_w = $ width; $ X = $ y = 0; /** * The thumbnail size cannot exceed the source image size (provided that there is only one width or height) */ If ($ width> $ src_w & $ height> $ src_h) | ($ height> $ src_h & $ width = 0) | ($ width> $ src_w & $ height = 0 )) { $ Proportion = 1; } If ($ width> $ src_w) { $ Dst_w = $ width = $ src_w; } If ($ height> $ src_h) { $ Dst_h = $ height = $ src_h; } If (! $ Width &&! $ Height &&! $ Proportion) { Return false; } If (! $ Proportion) { If ($ cut = 0) { If ($ dst_w & $ dst_h) { If ($ dst_w/$ src_w> $ dst_h/$ src_h) { $ Dst_w = $ src_w * ($ dst_h/$ src_h ); $ X = 0-($ dst_w-$ width)/2; } Else { $ Dst_h = $ src_h * ($ dst_w/$ src_w ); $ Y = 0-($ dst_h-$ height)/2; } } Else if ($ dst_w xor $ dst_h) { If ($ dst_w &&! $ Dst_h) // with width and height { $ Propor = $ dst_w/$ src_w; $ Height = $ dst_h = $ src_h * $ propor; } Else if (! $ Dst_w & $ dst_h) // you can specify the dst_h parameter. { $ Propor = $ dst_h/$ src_h; $ Width = $ dst_w = $ src_w * $ propor; } } } Else { If (! $ Dst_h) // No height during Cropping { $ Height = $ dst_h = $ dst_w; } If (! $ Dst_w) // No width during Cropping { $ Width = $ dst_w = $ dst_h; } $ Propor = min (max ($ dst_w/$ src_w, $ dst_h/$ src_h), 1 ); $ Dst_w = (int) round ($ src_w * $ propor ); $ Dst_h = (int) round ($ src_h * $ propor ); $ X = ($ width-$ dst_w)/2; $ Y = ($ height-$ dst_h)/2; } } Else { $ Proportion = min ($ proportion, 1 ); $ Height = $ dst_h = $ src_h * $ proportion; $ Width = $ dst_w = $ src_w * $ proportion; } $ Src = $ createfun ($ src_img ); $ Dst = imagecreatetruecolor ($ width? $ Width: $ dst_w, $ height? $ Height: $ dst_h ); $ White = imagecolorallocate ($ dst, 255,255,255 ); Imagefill ($ dst, 0, 0, $ white ); If (function_exists ('imagecopyresampled ')) { Imagecopyresampled ($ dst, $ src, $ x, $ y, 0, 0, $ dst_w, $ dst_h, $ src_w, $ src_h ); } Else { Imagecopyresized ($ dst, $ src, $ x, $ y, 0, 0, $ dst_w, $ dst_h, $ src_w, $ src_h ); } $ Otfunc ($ dst, $ dst_img ); Imagedestroy ($ dst ); Imagedestroy ($ src ); Return true; }

Usage

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$ Src_img = "./ROSI_050_002.JPG "; $ Dst_img = "./ROSI_050_002_thumb.jpg "; $ Stat = img2thumb ($ src_img, $ dst_img, $ width = 200, $ height = 300, $ cut = 0, $ proportion = 0 ); If ($ stat ){ Echo 'resize Image Success! <Br/> '; Echo ' '; } Else { Echo 'resize Image Fail! '; }