PHP upload images and secure handling

Upload image

 Public functionimages () {$data=$_files[' File ']; Switch($data[' Type '])            {                 Case' Image/jpeg ':$ext= ' jpg '; Break;  Case' Image/gif ':$ext= ' gif '; Break;  Case' Image/png ':$ext= ' png '; Break; default:$ext= "; Break; }            if($ext){                $file _name=uniqid().‘.‘.$ext;//the new file name                $tmp _name=$data[' Tmp_name '];//temporary file name on server                $file _size=$data[' Size '];//File Size                if($file _size> 204800){                    $result=Array(' stat ' = '-2 ', ' str ' = ' picture ' is greater than 200K '); EchoJson_encode ($result); Exit; }Else{                    $file _path= ' upload/'.$file _name; $img _path= "http://aaaaaaaaa/upload/".$file _name;//the table alone                     if(Move_uploaded_file($tmp _name,$file _path) ==true ){                         $result=Array(' stat ' = ' 1 ', ' str ' = ' + ' Add picture success ', ' img ' = ' + ')$img _path, ' pic ' =$file _name); }Else{                         $result=Array(' stat ' = '-2 ', ' str ' = ' + ' Add picture failed '); }                                                    EchoJson_encode ($result); Exit; }             }Else{                  $result=Array(' stat ' = '-2 ', ' str ' = ' picture ' is not formatted '); EchoJson_encode ($result); Exit; }        }

PHP upload images and secure handling