Php code for uploading Image proportional scaling

Php code for uploading Image proportional scaling

/** * * @ Author zhao jinhan * @ Date January 13, 2014 11:54:30 * @ Email xb_zjh@126.com * */ Header ('content-type: text/html; charset = utf-8 '); // Define the width and height of the thumbnail Define ('thumb _ width', 300 ); Define ('thumb _ height', 300 ); /** * Regenerate the uploaded file name * @ Return string * @ Author zhao jinhan * */ Function _ file_type ($ filetype = null ){ Switch ($ filetype) { Case "image/jpeg ": $ Fileextname = "jpg "; Break; Case "image/gif ": $ Fileextname = "gif "; Break; Case "image/png ": $ Fileextname = "png "; Break; Default: $ Fileextname = false; Break; } Return $ fileextname? Date ('ymdhis ', time ().'. '. $ fileextname: false; } /** * * @ Param string $ filename * @ Param string $ width * @ Param string $ height * @ Param string $ quality * @ Param string $ savepath * @ Return boolean */ Function _ make_thumb ($ filename = '', $ width = THUMB_WIDTH, $ height = THUMB_HEIGHT, $ savepath = './upload '){ If (file_exists ($ filename )){ // Size of the uploaded image $ Imagesize = getimagesize ($ filename ); $ Imagewidth = $ imagesize [0]; $ Imageheight = $ imagesize [1]; $ Mime = $ imagesize ['Mime ']; // Width/height ratio $ Ratio = $ imagewidth/$ imageheight; // Create a background image $ Bgimg = imagecreatetruecolor ($ width, $ height ); $ White = imagecolorallocate ($ BGB, 255,255,255 ); // The background color is white. Imagefill ($ bgimg, 0, 0, $ white ); If ($ mime = 'image/GIF '){ $ Im = @ imagecreatefromgif ($ filename);/* Attempt to open */ $ Outfun = 'imagegif '; } Elseif ($ mime = 'image/png '){ $ Im = @ imagecreatefrompng ($ filename);/* Attempt to open */ $ Outfun = 'imagepng '; } Else { $ Im = @ imagecreatefromjpeg ($ filename);/* Attempt to open */ $ Outfun = 'imagejpeg '; } If ($ ratio> 1 ){ // The width is large. If ($ imagewidth> $ width ){ // Scale the image to the background image $ New_width = $ width; $ New_height = ($ width * $ imageheight)/$ imagewidth; $ Bg_y = ceil (abs ($ height-$ new_height)/2 )); Imagecopyresampled ($ bgimg, $ im, 0, $ bg_y, 0, 0, $ new_width, $ new_height, $ imagewidth, $ imageheight ); } Else { // Copy the image to the background image $ Copy = true; } } Else { // High If ($ imageheight> $ height ){ // Scale the image $ New_height = $ height; $ New_width = ($ height * $ imagewidth)/$ imageheight; $ Bg_x = ceil ($ width-$ new_width)/2 ); Imagecopyresampled ($ bgimg, $ im, $ bg_x, 0, 0, 0, $ new_width, $ new_height, $ imagewidth, $ imageheight ); } Else { // Copy the image to the background image $ Copy = true; } } If ($ copy ){ // Copy the image to the background image $ Bg_x = ceil ($ width-$ imagewidth)/2 ); $ Bg_y = ceil ($ height-$ imageheight)/2 ); Imagecopy ($ bgimg, $ im, $ bg_x, $ bg_y, 0, 0, $ imagewidth, $ imageheight ); } $ Ext = _ file_type ($ mime ); $ Outfun ($ bgimg, $ savepath. '/'. $ ext ); Imagedestroy ($ bgimg ); Return $ savepath. '/'. $ ext; } Else { Return false; } } If ($ _ POST ){ $ Size = $ _ POST ['size']? Strtoupper (trim ($ _ POST ['size']): '2M '; $ Imgsize = $ _ FILES ['IMG '] ['size']? $ _ FILES ['IMG '] ['size']/(1024*1024): 0; $ Imgwidth = $ imgheight = $ _ POST ['width-height']? Intval ($ _ POST ['width-height']): 300; // Customize the file upload size Ini_set ('upload _ max_filesize ', $ size ); $ Mathsize = str_replace ('M', '', $ size ); If ($ imgsize> $ mathsize ){ Echo "the image size cannot exceed {$ size }! "; Return; } If ($ file_name = _ file_type ($ _ FILES ['IMG '] ['type']) { If ($ _ FILES ['IMG '] ['error'] = UPLOAD_ERR_ OK ){ $ Savepath = 'upload /'; If (! Is_dir ($ savepath )){ Mkdir ($ savepath, 0644 ); } // Generate a thumbnail $ Thumb_file = _ make_thumb ($ _ FILES ['IMG '] ['tmp _ name'], $ imgwidth, $ imgheight, $ savepath ); // Move_uploaded_file ($ _ FILES ['IMG '] ['tmp _ name'], $ savepath. $ file_name ); Echo "the generated image is :"; } Else { Echo $ _ FILES ['IMG '] ['error']; Return; } } Else { Echo "the image format is incorrect. Upload jpg, gif, and png formats! "; Return; } } Else { Echo < Save the scaled image as a square EOT; }