Code for php uploading pictures to scale pictures in equal proportions

/**
*
* @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 thumbnail Width and height
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)){
//Upload Image size
$imagesize=getimagesize($filename);
$imagewidth=$imagesize[0];
$imageheight=$imagesize[1];
$mime = $imagesize['mime'];
//Width and height Ratio
$ratio = $imagewidth/$imageheight;
//Create a new background image
$bgimg = imagecreatetruecolor($width, $height);
$white = imagecolorallocate($bgimg, 255, 255, 255);
// Fill the background color to 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 larger
if ($imagewidth > height-$new_height)/2));
imagecopyresampled($bgimg, $im, 0, $bg_y, 0, 0, $new_width, $new_height, $imagewidth, $imageheight);
}else{
//Copy image Go to the background image
$copy = true;
}
}else{
//The height is larger
if($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 file upload size
ini_set('upload_max_filesize',$size);
$mathsize = str_replace ('M','',$size);
if($imgsize>$mathsize){
echo "The image size must not 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 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, please upload jpg, gif, png format!";
return;
}
}else{
echo <<



 Scale the image and save it into a square




Upload a picture:

Maximum file size:

EOT;

}

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