php image upload and return upload file location to support multiple file upload

<?php
/**
 * Created by PhpStorm.
 * User: DY040
 * Date: 2018/4/26
 * Time: 13:23
 */
echo '<pre>';

/*
 * Support multiple file uploads to check whether all files meet the requirements and store them on the server and return the image address
 * */

class ImgUpload1
{
    protected  static  $imgs_file = array (); // Data to be returned (stored file information)

    function __construct($files)
    {

        foreach ($files as $k => $v) {
            $img_info = $files[$k];
            $arr = array();
            if (gettype($img_info['name']) === 'array') {

                foreach ($img_info['name'] as $key => $value) {
                    $arr['name'] = $img_info['name'][$key];
                    $arr['type'] = $img_info['type'][$key];
                    $arr['tmp_name'] = $img_info['tmp_name'][$key];
                    $arr['error'] = $img_info['error'][$key];
                    $arr['size'] = $img_info['size'][$key];
                    $this->_check($arr, $k);
                }
            } else {
                $this->_check($img_info, $k);
            }

        }


    }

    protected function _check($img_info, $index)
    {

        if (!isset(static::$imgs_file[$index])) {

            static::$imgs_file[$index] = $this->_img_store($img_info) . "*";
        } else {
            static::$imgs_file[$index] .= $this->_img_store($img_info) . "*";
        }


    }

    protected function _img_store($img_info)
    {

        // Check if the file is legal---File name suffix 
        $img_hzm = array ('.gif', '.png', '.jpg', '.jpeg' );
         $re = in_array ( strrchr ( $img_info ['name '], '.'), $img_hzm );
         if (! $re ) {
             return 'This image is invalid - file name suffix' ;
        }
        // Check whether the file is legal---MIME php detects the mime of uploaded information 
        if ( explode ('/', $img_info ['type'])[0] !== 'image' ) {
             return 'The image is invalid- MIME' ;
        }
        // Check whether the file is legal---MIME php detects local temporary files
        // Here we need to modify php.ini to add php_fileinfo.dll module 
        $file_info = new Finfo(FILEINFO_MIME_TYPE);
         $mime_type = $file_info -> file ( $img_info ['tmp_name' ]);
         if ( explode ('/', $mime_type )[0] !== 'image' ) {
             return 'This image is not valid - MIME' ;
        }
        // Set the file size to 1mb 
        if ( $img_info ['size'] > 1000000 ) {
             return 'The image is invalid - the file is larger than 1000kb' ;
        }
        // Is it a temporary file uploaded by http 
        if (! is_uploaded_file ( $img_info ['tmp_name' ])) {
             echo 'The file name is invalid' ;
             return  false ;
        };

        // Set the upload file address 
        if (! is_dir ('.\upload' )) {
             mkdir ('.\upload' );
        }

        $path = dirname ( __FILE__ ) . DIRECTORY_SEPARATOR . 'upload\\' . date ('Ymdh'); // Divide directory by hour 
        $imgType = strrchr ( $img_info ['name'], '.'); // File name suffix

        $re = is_dir($path);
        if (!$re) {
            mkdir($path);
        }


        $imgName = uniqid(rand(), true) . $imgType;
        $img_file = $path . DIRECTORY_SEPARATOR . $imgName;


        $upload_re = move_uploaded_file($img_info['tmp_name'], $img_file);
        if ($upload_re) {

            return $img_file;


        } else {

            return 'File upload failed' ;

        }

    }

    public function imgs_file()
    {
        $arr = static::$imgs_file;
        foreach ($arr as $k => $v) {


            if(gettype($_FILES[$k]['name'])==='string'){
                $arr[$k] = substr($v, 0, -1);
            }else{
                $arr[$k] = explode('*', substr($v, 0, -1));
            }
        }
        return $arr;
    }


}

$img_upload = new ImgUpload1( $_FILES );
 // Get the file location 
print_r ( $img_upload -> imgs_file());
 /*
 *
 * Array
(
    [user_img] => D:\PHP\www\hxq\day22\upload\2018042604\183775ae1878615f2e6.81933117.jpg
    [pro_img] => Array
        (
            [0] => D:\PHP\www\hxq\day22\upload\2018042604\324625ae18786172b65.94418381.jpg
            [1] => D:\PHP\www\hxq\day22\upload\2018042604\291675ae187861863e5.14296700.jpg
        )

)
 *
 * */
/*
 * Corresponding form
 *
 * <form action="imgUpload.class.php" method="post" enctype="multipart/form-data">
    <p><input type="file" name="user_img"></p>

    <p><input type="file" name="pro_img[]"></p>

    <p><input type="file" name="pro_img[]"></p>

    <p><input type="submit"></p>

</form>
 * */