- php tutorials to upload pictures and generate the specified size chart in proportion This is an image thumbnail function Oh, upload a new picture to $ srcfile Then file $ thumbwidth thumbnail width maximum size and thumb thumb size Small picture. Image thumbnail function parameter description:
$ srcfile original address $ dir new map directory $ thumbwidth Shrinks the maximum width of the image $ thumbheitht thumbnail image max size $ ratio default scaling to 1 is reduced to a fixed size. * / function makethumb ($ srcfile, $ dir, $ thumbwidth, $ thumbheight, $ ratio = 0) { / / Determine whether the file exists if (! file_exists ($ srcfile)) return false; // Create a new file of the same name, but the directory is different $ imgname = explode ('/', $ srcfile); $ arrcount = count ($ imgname); $ dstfile = $ dir. $ imgname [$ arrcount-1]; // Thumbnail size $ tow = $ thumbwidth; $ toh = $ thumbheight; if ($ tow <40) $ tow = 40; if ($ toh <45) $ toh = 45; // Get image information $ im = ''; if ($ data = getimagesize ($ srcfile)) { if ($ data [2] == 1) { $ make_max = 0; / / gif not dealt with if (function_exists ("imagecreatefromgif")) { $ im = imagecreatefromgif ($ srcfile); } } elseif ($ data [2] == 2) { if (function_exists ("imagecreatefromjpeg")) { $ im = imagecreatefromjpeg ($ srcfile); } } elseif ($ data [2] == 3) { if (function_exists ("imagecreatefrompng")) { $ im = imagecreatefrompng ($ srcfile); } } } if (! $ im) return '; $ srcw = imagesx ($ im); $ srch = imagesy ($ im); $ towh = $ tow / $ toh; $ srcwh = $ srcw / $ srch; if ($ towh <= $ srcwh) { $ ftow = $ tow; $ ftoh = $ ftow * ($ srch / $ srcw); } else { $ ftoh = $ toh; $ ftow = $ ftoh * ($ srcw / $ srch); } if ($ ratio) { $ ftow = $ tow; $ ftoh = $ toh; } // Zoom out the picture if ($ srcw> $ tow || $ srch> $ toh || $ ratio) { if (function_exists ("imagecreatetruecolor") && function_exists ("imagecopyresampled") && @ $ ni = imagecreatetruecolor ($ ftow, $ ftoh)) { imagecopyresampled ($ ni, $ im, 0, 0, 0, 0, $ ftow, $ ftoh, $ srcw, $ srch); } elseif (function_exists ("imagecreate") && function_exists ("imagecopyresized") && @ $ ni = imagecreate ($ ftow, $ ftoh)) { imagecopyresized ($ ni, $ im, 0, 0, 0, 0, $ ftow, $ ftoh, $ srcw, $ srch); } else { return } if (function_exists ('imagejpeg')) { imagejpeg ($ ni, $ dstfile); } elseif (function_exists ('imagepng')) { imagepng ($ ni, $ dstfile); } } else { // smaller than the size of the direct copy copy ($ srcfile, $ dstfile); } imagedestroy ($ im); if (! file_exists ($ dstfile)) { return } else { return $ dstfile; } } ?>
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