Php thumbnail code. the imagecopyresampled function generates a thumbnail.

Php thumbnail code. the imagecopyresampled function generates a thumbnail.

Function CreateImage ($ SrcImageUrl, $ DirImageUrl, $ Width, $ Height) { $ Img; $ Srcw; $ New_width; $ Srch; $ New_height; // Image type $ Type = substr (strrchr ($ SrcImageUrl, "."), 1 ); // Initialize the image If ($ type = "jpg ") $ Img = imagecreatefromjpeg ($ SrcImageUrl ); If ($ type = "gif ") $ Img = imagecreatefromgif ($ SrcImageUrl ); If ($ type = "png ") $ Img = imagecreatefrompng ($ SrcImageUrl ); $ Srcw = imagesx ($ img ); $ Srch = imagesy ($ img ); If ($ srcw/$ srch> $ Width/$ Height) { If ($ srcw> $ Width) { $ New_width = $ Width; $ New_height = $ srch * ($ Width/$ srcw ); } Else { $ New_width = $ srcw; $ New_height = $ srch; } } Else { If ($ srch> $ Height) { $ New_height = $ Height; $ New_width = $ srcw * ($ Height/$ srch ); } Else { $ New_width = $ srcw; $ New_height = $ srch; } } $ New_image = imagecreatetruecolor ($ new_width, $ new_height ); Imagecopyresampled ($ new_image, $ img, 0, 0, 0, 0, $ new_width, $ new_height, $ srcw, $ srch ); Imagejpeg ($ new_image, $ DirImageUrl ); Imagedestroy ($ img ); Imagedestroy ($ new_image ); } 3. improved code: /* * $ O_photo source image path * $ D_photo: Path of the processed image * $ Width defines the width. * $ Height defines the height. * Call method cutphoto ("test.jpg", "temp.jpg", 256,146 ); */ Function cutphoto ($ o_photo, $ d_photo, $ width, $ height ){ $ Temp_img = imagecreatefromjpeg ($ o_photo ); $ O_width = imagesx ($ temp_img); // Obtain the source image width. $ O_height = imagesy ($ temp_img); // obtain the original image height. // Determine the processing method If ($ width> $ o_width | $ height> $ o_height) {// The size of the source image width or height ratio is small and compressed. $ Newwidth = $ o_width; $ Newheight = $ o_height; If ($ o_width> $ width ){ $ Newwidth = $ width; $ Newheight = $ o_height * $ width/$ o_width; } If ($ newheight> $ height ){ $ Newwidth = $ newwidth * $ height/$ newheight; $ Newheight = $ height; } // Thumbnail $ New_img = imagecreatetruecolor ($ newwidth, $ newheight ); Imagecopyresampled ($ new_img, $ temp_img, 0, 0, 0, $ newwidth, $ newheight, $ o_width, $ o_height ); Imagejpeg ($ new_img, $ d_photo ); Imagedestroy ($ new_img ); } Else {// The original image width and height are larger than the specified size and are cropped after compression. If ($ o_height * $ width/$ o_width> $ height) {// first, make sure that the width is the same as the specified width. if the height is greater than the specified height, OK $ Newwidth = $ width; $ Newheight = $ o_height * $ width/$ o_width; $ X = 0; $ Y = ($ newheight-$ height)/2; } Else {// otherwise, the specified height is the same and the width is adaptive. $ Newwidth = $ o_width * $ height/$ o_height; $ Newheight = $ height; $ X = ($ newwidth-$ width)/2; $ Y = 0; } // Thumbnail $ New_img = imagecreatetruecolor ($ newwidth, $ newheight ); Imagecopyresampled ($ new_img, $ temp_img, 0, 0, 0, $ newwidth, $ newheight, $ o_width, $ o_height ); Imagejpeg ($ new_img, $ d_photo ); Imagedestroy ($ new_img ); $ Temp_img = imagecreatefromjpeg ($ d_photo ); $ O_width = imagesx ($ temp_img); // Obtain the thumbnail width. $ O_height = imagesy ($ temp_img); // Obtain the Thumbnail height. // Crop an image $ New_imgx = imagecreatetruecolor ($ width, $ height ); Imagecopyresampled ($ new_imgx, $ temp_img, 0, 0, $ x, $ y, $ width, $ height, $ width, $ height ); Imagejpeg ($ new_imgx, $ d_photo ); Imagedestroy ($ new_imgx ); } } ?>