Php image thumbnails implementation method, _ PHP Tutorial

Php image thumbnails ,. Php image thumbnail implementation method, function: Supports jpg, jpeg, gif, png, bmp image format, supports scaling according to the proportion of the original image, you can choose whether to implement php image thumbnails during image scaling,

Function: jpg, jpeg, gif, png, and bmp image formats are supported. you can scale the image according to the original image proportion. you can select whether to crop the image during image scaling, added image quality control to achieve the highest quality of the thumbnail. The complete class code is as follows:

 Srcimg = $ img; $ this-> resize_width = $ wid; $ this-> resize_height = $ hei; $ this-> cut = $ c; $ this-> quality = $ quality; $ this-> type = strtolower (substr (strrchr ($ this-> srcimg ,'. '), 1); // the image type $ this-> initi_img (); // initialize the image $ this-> dst_img ($ dstpath ); // target Image address @ $ this-> width = imagesx ($ this-> im); @ $ this-> height = imagesy ($ this-> im ); $ this-> newimg (); // generates an image @ ImageDestroy ($ this-> im);} function newimg () {$ resize_ratio = ($ this-> re Size_width)/($ this-> resize_height); // ratio of the changed image @ $ ratio = ($ this-> width)/($ this-> height ); // ratio of the actual image if ($ this-> cut) = '1 ') {// Cut image if ($ img_func = 'imagepng '& (str_replace ('. ', '', PHP_VERSION)> = 512) {// processing status after the php version is greater than 5.12 parameter change $ quality = 9 ;} if ($ ratio >=$ resize_ratio) {// high priority $ newimg = imagecreatetruecolor ($ this-> resize_width, $ this-> resize_height); imagecopyresampled ($ newimg, $ this-> im, 0, 0, 0, $ this-> resize_width, $ This-> resize_height, ($ this-> height) * $ resize_ratio), $ this-> height); imagejpeg ($ newimg, $ this-> dstimg, $ this-> quality);} if ($ ratio <$ resize_ratio) {// width first $ newimg = imagecreatetruecolor ($ this-> resize_width, $ this-> resize_height ); imagecopyresampled ($ newimg, $ this-> im, 0, 0, 0, $ this-> resize_width, $ this-> resize_height, $ this-> width, ($ this-> width)/$ resize_ratio); imagejpeg ($ newimg, $ this-> dstimg, $ this-> qual Ity) ;}} else {// no picture if ($ ratio >=$ resize_ratio) {$ newimg = imagecreatetruecolor ($ this-> resize_width, ($ this-> resize_width) /$ ratio); imagecopyresampled ($ newimg, $ this-> im, 0, 0, 0, $ this-> resize_width, ($ this-> resize_width)/$ ratio, $ this-> width, $ this-> height); imagejpeg ($ newimg, $ this-> dstimg, $ this-> quality);} if ($ ratio <$ resize_ratio) {@ $ newimg = imagecreatetruecolor ($ this-> resize_height) * $ ratio, $ this-> resize _ Height); @ imagecopyresampled ($ newimg, $ this-> im, 0, 0, 0, ($ this-> resize_height) * $ ratio, $ this-> resize_height, $ this-> width, $ this-> height); @ imagejpeg ($ newimg, $ this-> dstimg, $ this-> quality) ;}} function initi_img () {// initialize the image if ($ this-> type = 'jpg '| $ this-> type = 'jpeg ') {$ this-> im = imagecreatefromjpeg ($ this-> srcimg);} if ($ this-> type = 'GIF ') {$ this-> im = imagecreatefromgif ($ this-> srcimg);} if ($ this-> typ E = 'PNG ') {$ this-> im = imagecreatefrompng ($ this-> srcimg);} if ($ this-> type = 'wbm ') {@ $ this-> im = imagecreatefromwbmp ($ this-> srcimg);} if ($ this-> type = 'bmp ') {$ this-> im = $ this-> ImageCreateFromBMP ($ this-> srcimg) ;}} function dst_img ($ dstpath) {// Image target address $ 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;} function ImageCreateFromBMP ($ filename) {// custom function to process bmp image if (! $ F1 = fopen ($ filename, "rb") returnFALSE; $ FILE = unpack ("vfile_type/Vfile_size/Vreserved/Vbitmap_offset", fread ($ f1, 14 )); if ($ FILE ['File _ type']! = 19778) returnFALSE; $ BMP = unpack ('vheader _ size/Vwidth/Vheight/vplanes/vbits_per_pixel '. '/Vcompression/Vsize_bitmap/Vhoriz_resolution '. '/Vvert_resolution/Vcolors_used/Vcolors_important', fread ($ f1, 40); $ BMP ['color'] = pow (2, $ BMP ['bits _ per_pixel ']); if ($ BMP ['size _ bitmap'] = 0) $ BMP ['size _ bitmap'] = $ FILE ['File _ size']-$ file ['bitmap _ offset']; $ BMP ['bytes _ per_pixel '] = $ BMP ['bits _ per_pixel']/8; $ BMP ['bytes _ pe R_pixel2 '] = ceil ($ BMP ['bytes _ per_pixel']); $ BMP ['desc'] = ($ BMP ['width'] * $ BMP ['bytes _ per_pixel ']/4 ); $ BMP ['desc']-= floor ($ BMP ['width'] * $ BMP ['bytes _ per_pixel ']/4 ); $ BMP ['demo'] = 4-(4 * $ BMP ['demo']); if ($ BMP ['demo'] = 4) $ BMP ['desc'] = 0; $ PALETTE = array (); if ($ BMP ['color'] <16777216) {$ PALETTE = unpack ('V '. $ BMP ['Colors '], fread ($ f1, $ BMP ['Colors'] * 4);} $ IMG = fread ($ f1, $ BMP ['size _ bitmap']); $ VIDE = chr (0 ); $ Res = imagecreatetruecolor ($ BMP ['width'], $ BMP ['height']); $ P = 0; $ Y = $ BMP ['height']-1; while ($ Y> = 0) {$ X = 0; while ($ X <$ BMP ['width']) {if ($ BMP ['bits _ per_pixel '] = 24) $ COLOR = unpack ("V", substr ($ IMG, $ P, 3 ). $ VIDE); elseif ($ BMP ['bits _ per_pixel '] = 16) {$ COLOR = unpack ("n", substr ($ IMG, $ P, 2); $ COLOR [1] = $ PALETTE [$ COLOR [1] + 1];} elseif ($ BMP ['bits _ per_pixel '] = 8) {$ COLOR = unpack ("n", $ VIDE. substr ($ IMG, $ P, 1); $ COL OR [1] = $ PALETTE [$ COLOR [1] + 1];} elseif ($ BMP ['bits _ per_pixel '] = 4) {$ COLOR = unpack ("n", $ VIDE. substr ($ IMG, floor ($ P), 1); if ($ P * 2) % 2 = 0) $ COLOR [1] = ($ COLOR [1]> 4); else $ COLOR [1] = ($ COLOR [1] & 0x0F ); $ COLOR [1] = $ PALETTE [$ COLOR [1] + 1];} elseif ($ BMP ['bits _ per_pixel '] = 1) {$ COLOR = unpack ("n", $ VIDE. substr ($ IMG, floor ($ P), 1); if ($ P * 8) % 8 = 0) $ COLOR [1] = $ COLOR [1]> 7; elseif ($ P * 8) % 8 = 1) $ COLOR [1] = ($ COLOR [1] & 0x40)> 6; Elseif ($ P * 8) % 8 = 2) $ COLOR [1] = ($ COLOR [1] & 0x20)> 5; elseif ($ P * 8) % 8 = 3) $ COLOR [1] = ($ COLOR [1] & 0x10)> 4; elseif ($ P * 8) % 8 = 4) $ COLOR [1] = ($ COLOR [1] & 0x8)> 3; elseif ($ P * 8) % 8 = 5) $ COLOR [1] = ($ COLOR [1] & 0x4)> 2; elseif ($ P * 8) % 8 = 6) $ COLOR [1] = ($ COLOR [1] & 0x2)> 1; elseif ($ P * 8) % 8 = 7) $ COLOR [1] = ($ COLOR [1] & 0x1 ); $ COLOR [1] = $ PALETTE [$ COLOR [1] + 1];} else returnFALSE; imagesetpixel ($ res, $ X, $ Y, $ COLOR [1]); $ X ++; $ P + = $ BMP [' Bytes_per_pixel '];} $ Y --; $ P + = $ BMP ['dece'];} fclose ($ f1); return $ res ;}}?>

The usage code is as follows:

$resizeimage=new ResizeImage('upload/abc.bmp', '120', '90', '0', 'upload/xabc.bmp');

Related reading:

Code sharing for generating image thumbnails using php

Php batch generation of image thumbnails

Php image thumbnails phpThumb

Implementation of php image thumbnails

Php uploads images to generate thumbnails (GD Library)

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