文件上传

//upload_file.php

<?php

/**
*  class Manager
*/
class Manager
{
    // the message
    public $sendResponse;

    function __construct()
    {
        $sendResponse = "";
    }
    
    /**
    * Returns data in JSON format
    * @param $success  upload true or false
    * @param $message  response the message
    * @param $code     default 200
    */
    private function message(
        $success,
        $message = NULL,
        $code = 200
    )
    {
        $response = array(
            'success' => (bool) $success,
            'message' => $message,
            'code'    => (int) $code
        );

        header('Content-Type: application/json;charset=utf-8', TRUE, $httpCode);
        $this->sendResponse = json_encode($response);
    }

    /**
    * A function to upload files
    * @param $file  Uploaded file from front-end  
    */
    public function upload_file($file, $folder='upload')
    {
        if (isset($file)) {
            if ($file["error"] > 0){
                $this->message(FALSE, "Find a incorrect");
            }
            else{
                if (file_exists($folder . "/" . $file["name"])){
                    $msg = $file["name"] . " already exists. ";
                    $this->message(FALSE, $msg);
                }else {
                    move_uploaded_file($file["tmp_name"], $folder . "/" . $file["name"]);
                    $this->message(TRUE, "Success");
                }
            } 
        }
        else{
            echo "Invalid file";
        }       
    }
}

$file = $_FILES["file"];
$manager = new Manager();
$manager->upload_file($file);
echo $manager->sendResponse;

?>