用php实现多文件上传、多图片上传的一例代码，学习下php上传多文件的思路与方法

实现：
1，在同级目录下建立upload文件夹
2，保存以下代码为文件upload.php。

<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />  
<?php
$uptypes = array(
//上传文件的ContentType格式
'image/jpg', 'image/jpeg', 'image/png', 'image/pjpeg', 'image/gif', 'image/bmp', 'image/x-png', 'application/msword', //doc
'application/vnd.openxmlformats-officedocument.wordprocessingml.document', //docx
'application/vnd.openxmlformats-officedocument.presentationml.presentation', //pptx
'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet', //xlsx
'text/plain');
/**
 * php多文件、多图片上传
 * by www.junphp.com
 */
$max_file_size = 2000000; //上传文件大小限制, 单位BYTE
$dir = "upload/"; //上传文件路径
if ($_SERVER['REQUEST_METHOD'] == 'POST') {
    $file = $_FILES['upfile']['name'];
    foreach ($file as $key => $item) {
        if ($item != '') {
            if (!is_uploaded_file($_FILES['upfile']['tmp_name'][$key])) //是否存在文件
            {
                echo "图片不存在!";
                exit;
            }
            if ($max_file_size < $_FILES['upfile']['size'][$key]) //检查文件大小
            {
                echo "文件太大!";
                exit;
            }
            if (!file_exists($dir)) {
                mkdir($dir);
            }
            $filename = $_FILES['upfile']['tmp_name'][$key];
            $image_size = getimagesize($filename);
            $pinfo = pathinfo($file[$key]);
            $ftype = $pinfo['extension'];
            $destination = $dir . time() . $file[$key];
            if (file_exists($destination) && $overwrite != true) {
                echo "同名文件已经存在了";
                exit;
            }
            if (!move_uploaded_file($filename, $destination)) {
                echo "移动文件出错";
                exit;
            }
            $pinfo = pathinfo($destination);
            $fname = $pinfo['basename'];
            echo " <font color=red>已经成功上传</font><br>文件名:  <font color=blue>" . $dir . $fname . "</font><br>";
            echo " 宽度:" . $image_size[0];
            echo " 长度:" . $image_size[1];
            echo "<br> 大小:" . $_FILES['upfile']['size'] . " bytes";
        }
        echo "<br>图片预览:<br>";
        echo "<img src=\"" . $destination . "\" width=" . ($image_size[0] * (1 / 4)) . " height=" . ($image_size[1] * (1 / 4));
        echo " alt=\"图片预览:\r文件名:" . $destination . "\r上传时间:\">";
        echo "<br>";
    }
}
?>  
<form method="post" enctype="multipart/form-data" action="" name="ff" id="ff" >  
    <input type="file" name="upfile[]" />  
    <input type="file" name="upfile[]" />  
    <label>  
      <input type="submit" name="submit" id="submit" value="按钮"/>  
    </label>  
 </form>