Upload pictures (with content that can be modified, non-function)

Implement the function of uploading pictures

date_default_timezone_set("PRC");
header("content-type:text/html;charset=utf-8");
require_once("./function1.php");
if (isset($_GET['act']) && ($_GET['act'] == "uploads")){
 //Determine whether the uploaded file is legal
 if(!is_uploaded_file($_FILES['avator'][ tmp_name])){
 msg("The uploaded file is illegal");
 }
 //Determine the file size
 $allowed_size = 2*1024*1024;
 if($_FILES['avator']['size']> ;$allowed_size){
 msg("The uploaded picture is too large, please modify it and re-upload it");
 }
 //Judge the type
 $allowed_type = array("jpg","bmp","gif","jpeg ","png","zip","rar","txt");
 $path_info_arr = pathinfo($_FILES['avator']['name']);//Get the array of file types
 $extension = strtolower($path_info_arr['extension']);
 if(!in_array($extension,$allowed_type)){
 msg("The uploaded type is not allowed");
 }
 //Rename
 if(!file_exists( "./uploads/")){
 @mkdir("./uploads/",0777,true);
 }
 $new_name = date("YmdHis").rand(1000,9999).".".$ extension;
 //Move

 $res = move_uploaded_file($_FILES['avator']['tmp_name'],"./uploads/{$new_name}");
 if($res){

 echo "< ;a href='./uploads/{$new_name}'>View uploaded files";

 }
}else{
 ?>

 Please upload files



}