PHP supports generating thumbnail file upload code_PHP tutorial

php tutorial supports generating thumbnail file upload code
?>

class upfileclass {

var $upfile, $upfile_name, $upfile_size;
# $upfile temporary file name $_files['tmp_name'], $upfile_name file name $_files['name'], $upfile_size file size $_files['size'];

var $new_upfile_name; # The name of the uploaded file;
var $fleth, $fileextent; # File extension (type);
var $f1, $f2, $f3; # File saving path (multi-level) upfiles/2008-01/08/;
var $filename; #File (with path);
var $filepath; #Relative path is used to delete files;
var $maxsize, $file_type; # The size of files allowed to be uploaded and the type of files allowed to be uploaded;

var $buildfile,$newfile,$file_width,$file_height,$rate;

function upfileclass($upfile,$upfile_name,$upfile_size){
$this->upfile = $upfile;
$this->upfile_name = $upfile_name;
$this->upfile_size = $upfile_size;
$this->new_upfile_name = $this->createnewfilename($this->upfile_name);
$this->f1 = "upfiles";
$this->f2 = $this->f1."/".date('y')."-".date('m');
$this->f3 = $this->f2."/".date('d');
$this->filename = $this->f3 . "/" . $this->new_upfile_name;
$this->maxsize = 500*1024; #File size 500kb
$this->file_type = "gif/jpg/jpeg/png/bmp"; # File types allowed to be uploaded
}

#Create new file name (original file name)
function createnewfilename($file_name){
$this->fleth = explode(".",$file_name);
$this->fileextent = $this->fleth[(int)count($this->fleth)-1]; # Get file suffix;
$tmps tutorial tr = date('ymd').rand(0,time()) . "." .$this->fileextent; # Create a new file name;
Return $tmpstr;
}

# Check whether the file type is correct
function chk_fileextent(){
$iwtrue = 0;
$fle = explode("/",$this->file_type);
for($i=0; $i < count($fle); $i++){
If($this->fileextent == $fle[$i]){
$iwtrue = (int) $iwtrue + 1;
}
}
If( $iwtrue == 0 ){
$this->msg("The file does not conform to the ".$this->file_type." format!");
}
}

# Prompt an error message and terminate the operation
function msg($error){
echo "n";
Die();
}

# Save file
function savefile(){
$this->chk_fileextent();
$this->chk_filesize();
$this->createfolder( "../".$this->f1 );
$this->createfolder( "../".$this->f2 );
$this->createfolder( "../".$this->f3 );
Return $this->chk_savefile();
}

# Check whether the upload result is successful
function chk_savefile(){
$copymsg = copy($this->upfile,"../".$this->filename);
If( $copymsg ){
Return $this->filename;
}
else{
$this->msg("File upload failed! nnPlease upload again! ");
}
}

# Create folder
function createfolder($foldername){
If( !is_dir($foldername) ){
mkdir($foldername,0777);
}
}

#Detect file size
function chk_filesize(){
If( $this->upfile_size > $this->maxsize ){
$this->msg("The target file cannot be larger than ". $this->maxsize/1024 ." kb");
}
}

#Delete file ($filepath file relative path)
function deletefile($filepath){
If( !is_file($filepath) ){
Return false;
}
else{
$ending = @unlink($filepath);
Return $ending;
}
}

/*
Function: Generate thumbnail
makebuild("/www.bKjia.c0m/a.jpg","news/b.jpg","100");
Parameters:
Echo $buildfile; Original image with path
Echo $newfile; Generated thumbnail with path
Echo $file_width; Thumbnail width value
Echo $file_height; Thumbnail height value (default is the proportion of width)
Echo $rate; Thumbnail image quality;
*/
function makebuild($buildfile,$newfile,$file_width,$file_height=0,$rate=100) {
If(!is_file($buildfile)){
$this->msg("The file ".$buildfile." is not a valid graphics file! The nn system cannot generate a thumbnail for the file!");
Return false;
}
$data = getimagesize($buildfile);
Switch($data[2]){
case 1:
$im = @imagecreatefromgif($buildfile);
Break;
case 2:
$im = @imagecreatefromjpeg($buildfile);
Break;
case 3:
$im = @imagecreatefrompng($buildfile);
Break;
}
If(!$im){
Return false;
}
else{
$srcw = imagesx($im); # Get the width of the original image;
$srch = imagesy($im); # Get the height of the original image;
$dstx = 0;
$dsty = 0;
 
if($file_height==0){
$file_height = $file_width/$srcw*$srch;
}
 
if ($srcw*$file_height>$srch*$file_width){
$ffile_height = round($srch*$file_width/$srcw);
$dsty = floor(($file_height-$ffile_height)/2);
$ffile_width = $file_width;
}
else {
$ffile_width = round($srcw*$file_height/$srch);
$dstx = floor(($file_width-$ffile_width)/2);
$ffile_height = $file_height;
}
$ni = imagecreatetruecolor($file_width,$file_height);
$dstx = ($dstx<0)?0:$dstx;
$dsty = ($dstx<0)?0:$dsty;
$dstx = ($dstx>($file_width/2))?floor($file_width/2):$dstx;
$dsty = ($dsty>($file_height/2))?floor($file_height/s):$dsty;
imagecopyresized($ni,$im,$dstx,$dsty,0,0,$ffile_width,$ffile_height,$srcw,$srch);
 
Imagejpeg($ni,$newfile,$rate); # Generate thumbnail;
imagedestroy($im); # imagedestroy(resource) Release the memory associated with image
}
}

}
?>

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